Tbf it’s not so much the expo start that does this, it’s a season reset on the mythic.
When it resets the ilevel shoot up, but players are geared from last season so they aren’t yet ready for 10s plus (I mean some probably still did, in their guild groups).
At the start of the season ilevel expectations are lower as everyone is regearing for the new season and acquainting themselves with the affix.
Give it a week or two and people are geared and now those people who were doing it “progressively” are now doing it “professionally” ie pushing keys as high as they can, AFAIK they inflate ilevel expectations on their lower keys to quickly jump them by +3.
If you “missed” this initial week or two of mythic, yeah the scene will look pretty unforgiving in terms of some expectations. However not all groups expect this obviously.
The other thing is raider io. People tend to take this more importantly than gear per say. The tricky part is running the dungeons in the first place to build your score, and this can be an issue if the requirements for entering those dungeons is inflated.
I’d recommend joining a community that has a more casual approach to mythic. That way you can find groups easily without the io gatekeeping. The runs probably won’t be the most progressive you’ve experienced as the players therein aren’t chasing highest keys (more often just aiming for a weekly 10 and maybe trying a bit higher for lols) but it will get you groups and the gear that comes out of them.
I’m in one myself as my io score is pretty low, but I’m using such community to try and build it a bit more and work on improving my tank play in an environment that is free of the sometimes cutthroat expectations of pugging. That and I don’t want to mess up another players key because I’m still learning.