I think it's just that we're hitting an "end of version" wall. They're obviously holding on to a lot of stuff to release in 3.0 with Sumeru etc.
Regarding the complaints that the game has gotten stale, I understand but don't agree. Genshin more than any other AAA on the market has given players ridiculous amounts of content, potentially completely for free. We've gotten so many different types of events, some hits, but a lot of misses. Still, you can't say that they don't try to shake it up. For as much as I hate Mechanicus, at least it's a different mode built within the confines on the game. They had the dungeon builder, several types of combat events, festivals, the entire teapot system which was way more than I was expecting for a "player housing" feature, flower designing, food events (bleeggghh), etc etc etc.
Not to mention that the last 3 areas have been super high quality, with tons of effort put in by the visuals, music, design/puzzle, and the world lore teams. It's understandable if you don't care about the story or lore, but it's hard to argue that they haven't been doing their part on it.
I think it's perfectly reasonable to get tired of playing the game everyday and to take a break. Can you imagine playing BotW straight every day for a year and a half? Or any game, regardless of how good it is. I don't really mind personally since I've played a lot of gachas in the past (and MMOs before that) and the "log in and do dailies" thing is a total non issue for me, but I do get the burnout.
If anything, I think the quality of the content released consistently has gone up, disregarding personal taste for some of the events.
If you guys need a break, this is probably the best time to take one. Go do other things, refresh yourselves, and get ready to come back for 3.0, which I'm assuming is coming directly after 2.8 personally.
*edit*
Looks like the livestream is delayed due to the Shanghai COVID situation: