Some players are on MinMax overdrive
That rule comes from Tasha’s Cauldron of Everything which is compatible with the 2024 update so it’s still a valid RAW interpretation according to WOTC.
They carried forward all the other optional rules from Tasha’s, and not the that one. Clearly they didn’t like something about it.
They didn’t carry Artificers forward into the new PHB but they’re still a valid class. This rule not being in the newest books only means it didn’t need modification to fit with the new material not that it is no longer valid.
2024 is not a new version that completely replaces 2014, it’s an update where things stay the same unless they’re mentioned in the newer material, hence all the official adventure books being compatible with 2024.
I’d agree in general, but they copied the other rule about falling into liquid off the same page from Tasha’s without modifications and not the rules for falling onto other creatures.
They specifically chose not to have those rules when it would have been no effort to add them.
And they did update falling, by adding the section about falling into liquid, and describing it as a hazard.
That signals to me they very clearly did not want those rules as the new baseline for the game.
