Well said. 5e is simply joining the ranks of past editions. As time goes on, the shine wears off, and we start digging in to the warts. Every edition has them, and I do agree 5e overall is a step up (the closest is epic 6 3e, which is honestly the best version of 3rd edition that limits its biggest problems). But it has its flaws, and I think where it really came into play for me was that 5.5e did very very little to address it.The thing is, despite all my complaints, I actually think 5e is a well designed game. It has issues, but it works reasonably well for most people despite of them. They also are such that a GM who is aware of them can address them in variety of ways.
I think issues with both 3e and 4e were way more fundamental. The things people had issues with were part of the core design assumptions of these games.
Still, this does not mean that I think these issues with 5e should not be addressed, and I think relying for the GM to fix things is not very newbie friendly. And sadly it seems 5.5 has mostly removed the tools and advice for the GM to customise the game. They were lacking before, but now they're just basically gone. 5.5. was a big disappointment for me, and I wish they had done a more extensive revamp.
When 3.5 came in, it was a MASSIVE change. Classes, monsters, mechanics, magic items, everything got some big updates. It was truely an attempt to correct many of the mistakes in 3e...and it did. It still had plenty left, but it felt a serious attempt to move the edition forward. When 3.5 came out, I could not imagine going back to 3e.
5.5 does not feel that way at all to me. It has a few spell improvements, the classes got some buffs, some adjustments to the monster math....but 5.5 does not feel like it really polished the game to me. I have taken a serious look at 5.5 to decide if my next campaign will use it, and I just can't find a reason to reteach my players.
Which makes the warts of 5e even more obvious and annoying to look at. Its a "you could have fixed this WOTC, you had feedback for years...but you didn't do it"