To sort of play Anvil’s advocate (but not speaking for them, to be clear–just my personal two cents), the default Data Tables caching/fetching behavior that is due to change was never a documented feature, so there wasn’t even that form of implicit assurance that it wouldn’t change. Relying on undocumented implementation behavior is at-your-own-risk.
Also, for anyone concerned about the fetching/caching behavior of Data Tables, there’s been 10 months to experiment with taking greater control of that behavior via the Accelerated Tables Beta. (There hasn’t been a way to take control of get_user fetching, though, so I’m relieved to see that being prioritized now.)