So? Its educational, interesting and valuable. Thousands of people see the duplicate structure that would otherwise see only the destroyed hulk in books.
And a guitar is quite different from a vast structure from antiquity? Not valuable just because they were touched by some famous dude. "Birthplace of democracy" vs "Blue Suede Shoes".
You can't take something out of the context in which it was created and strip it of it's original meaning and have the same thing.
The guitar Elvis used has the same spirit imbued into it, that his music possessed and his fans enjoyed. Any other guitar, is just a guitar. There are cars, boats, houses, ect that have this same effect of carrying a higher meaning.
Buildings have a connection to the landscape around them. Something aesthetically pleasing in architecture works in harmony with the nature/city surrounding it. Many buildings are an eyesore because they do not fit into their surroundings. Many of the british Edwardian masterpieces didn't work when recreated in australia. Parthenon works on it's original landscape.
The techniques that go into building them have a relevance to the society around them. A cathedral can be a 300yr construction cycle as a testament to entirely new building techniques like a domed roof. The first building to carry that maintains the meaning of a step forward for humanity. Subsequent buildings don't carry that meaning. Building a cathedral now with a domed roof takes like a year and is cheap, commonplace and uninteresting. The Parthenon's warped foundation to trick you into thinking it's a straight building is not an necessary technique any more, though amazing for that time period.
Museums in britian that contain all the dead art to ever be considered worth preserving tried to charge an entry fee (gold coin donation, 2015ish) instead of being free to the public and admission dropped by 25%. The value of preservation is quite low.
Texas is not the birthplace of democracy, and it is not interesting spamming out parthenons with modern tooling. The excess of modern perfection completely minimizes the original achievement, all you are preserving is the recipe-book for building that particular pattern of concrete. The only spirit a faux-parthenon in texas carries is crass commercial reproduction of long-passed european greats. Like a plastic Disney castle vaguely imitates european castles, a parthenon in Texas is a pointless attempt at claiming something the state didn't earn and can't own by definition.
Make something that is unique and special that could only be made in Texas. There are unique set of materials, landscape, people, social culture and attitudes, desires of what needs to be expressed in the culture. We only have one Texas, it needs to be Texan and not faux-greece. Any given patch of land yearns for it's own self-expression. I can't see any other way of building, nor the virtue in dropping foreign works from a great height into an empty landscape.
There's a lot of classical revival buildings around New Orleans and they fit into the landscape just fine, IMHO - visiting the Peristyle or Popp's Fountain in City Park is always super chill. They fit well into hot sweaty climates. Lots of room for a cool breeze to blow through, lots of space for hot air to rise to the ceiling.
Also, if you build a full-scale Parthenon complete with giant gilded statue of Athena, I think it is pretty arguable that you are deliberately inviting that same spirit to dwell in your city. I would bet money there have been people performing rituals to various Greek gods in the Nashville Parthenon since its inception. Admittedly I may be biased by living in a city that's been having parades in the honor of assorted Greek gods for the past hundred years or so; Mardi Gras is a heck of a thing.
Ignoring of course the reconstruction of the way it might have looked originally. Which the 'owners' of the building have not done. And which informs and can indeed inspire.
Hey the museum that holds the David has a half-dozen copies placed around the building, to help reduce the congestion of the line to see the original. Are they crass? Are they not 'earned'?
The 'owners' of the originals cannot of course remodel them to show how they looked in the past, which can be hard to understand from ruins. Folks often express regret at the damage done by one war or ruler or whatever. Yet reversing it is a bigger crime, because its a treasure.
The meaning of the reproduction is, "Hey this is how it might have looked when it was intact." Its interesting and informative. The scale of it has the same ability to inspire the scale of the original had.
We build new things all the time. Texas has many outstanding architectural treasures. That has zippo to do with this subject. Drawing a dichotomy is irrelevant, as building one doesn't preclude building the other.
That all sounds like gobbledygook. The 'spirit imbued' is made-up nonsense. So is the 'meaning'. Its a building, and its interesting and exciting to see how great structures of the past looked.
It's "educational" in the same sense that selling an action figure of the Artemision Bronze, or the Antikythera Ephebe, would be "educational", i.e. its true purpose is to make $$$ by selling an easy but empty sense of fulfillment to people who don't have the time to educate themselves, or the inclination to do it too far away from a Wendy's apparently.
And a guitar is quite different from a vast structure from antiquity? Not valuable just because they were touched by some famous dude. "Birthplace of democracy" vs "Blue Suede Shoes".