Postgres has focused on being a stellar database, not on being a stellar exascale application platform. It deserves the love it's getting on the database side, and for most people the weak exascale story isn't a problem.
Sure, but this post is specifically about a tool that relates to that weak story. In the context of the use cases PgCat is trying to address, Postgres is most definitely not "the greatest". Apparently, that's a controversial statement :)
I don't think calling out the far end of the postgres scaling story is controversial. On the low end, you can add more hardware or improve queries/indexes, and the mid level works fine with a write master and read replicas, but once you get into multi-master/sharding it's definitely more involved than other systems, and if you just use postgres as a dumb data dump, maybe the value isn't there. It's all about the right tool for the job.
Of course, there will always be fanboys who take things too far.
