Thoughts and impressions:
1. I think with all the griping about DT, people forget something: there was a whole lot of griping from a lot of people about EW, too. Yes, its introduction numbers were massive... but they did drop, and the griping began pretty quickly, as a chunk of people continuously compared it negatively to SHB. Part of why so many were excited about EW (and poured back in) was they'd loved SHB... and then they backed off when they found "it's not the same," for whatever reason. And the complainers just got fresh meat with DT, in some ways at least. (Covid may have also played a part in people *initially* swarming into EW.)
2. I think Yoshi, especially, just flat freaked out over the long log-in waits for EW. Granted they *were* long, but I suspect they've over-compensated for that with the "congested" system: that the numbers they set to "decide" a world is "getting too much traffic" for visits at the very least, are set way too low. I can't say how this affects the *transfer and new character creation* aspects, but for DC travel, it causes them, IMO, to pre-emptively block out travel, like they've been doing on Aether---and notice that they block Aether for DC travel every time they release a patch now? And then take a while to start easing up on it?
3. From what I've heard from several people (on here and elsewhere), the biggest "causes" of congestion on Aether seem to be three sources: streamers who joined there and then their friends and fans went to be with them and joined (or moved) there; a lot of the folks who regularly run duty fights (all types) grouped up there, and apparently some big RPG groups. I agree with others who've said that in regards to the middle group (the fighters), if they'd just open up fight queues to pull cross-DC, it would help a LOT. It's ridiculous that on one DC someone may wait just a few minutes for something to queue... and on less populated DCs it may take HOURS. (They could also do this for PvP, and maybe things that stay mostly dead like Rival Wings, wouldn't stay mostly dead.)
(See next post)