I don't really see that myself. I don't see a lot of "5e is perfect, how dare you question it".In 2014-2018 period there was a lot less name-calling and real aggression or the like, and a lot more "Oh, you're just silly for saying there's anything wrong with 5E, let's continue discussing how great 5E is!", and that just never happened with 3E or 4E, not even at their peak popularity. It was a whole other thing. No rules lawyering, not really "angry" rhetoric, just dismissiveness towards the entire concept that 5E could be flawed. I don't think it was a majority opinion, but it was large minority, which more recently has shrunk considerably.
What I do think is that with the rise of "rulings not rules" game debate is more subjective now. In 3e we got our rules lawyer hates on and could concretely debate the system day in and day out. And boy did we! Everything was put under the microscope, because technically in 3e there was the "RAW way to do things" and the "houserule way". And if you houseruled thats fine, but when you debated the system you debated RAW.
In 5e, the system decisively puts more of the game resolution into the DMs hands. So there are many topics where people are naturally going to have different experiences based on Dm handling. Now this happened in 3e as well but there was more an expectation to "follow the rules". So a lot of times in 5e, the debate comes down to "well my dm does it this way and we love it".... which may be perfectly true but also makes it hard to have full discussions on whether the system is serving the greater goal of helping groups craft better gaming experiences.