What is interesting to me is how recent Occaam's razor is (800 years) and why it was introduced (to understand the Trinity in western Christianity).
It's been a successful heuristic, but for understanding the things that can be understood simply - we shouldn't believe that nature "wants" to be simple though...
Occam's razor in a lot of ways is a proxy for Bayes' theorem. The theorem "punishes" more complex models by shrinking the prior term and increasing the marginal term, while the likelihood is pegged at P = 1.0 at most.
You can come up with a model that perfectly explains the outcome ( P(e|H) = 1 ) but you have to offset the insane improbability of pegging all those free parameters at the value they are at ( P(H) ).
Known in science as Occaam's razor.
> maybe we just didn't understand gravity very well
We definitely don't understand it when it comes to quantum scales. And maybe we don't understand it properly at macro scales.
But know that the universe is in no way obligated to be simple to the layman.
E.g. Speed of light seems to be constant, so we're going to make up all this bizarre stuff about time dilation and space faring twins.