The coaching carousel in general should be EA's top priority for dynasty mode in 26 IMO.
The mode is essentially a coach simulator, but outside of recruiting (which is phenomenal) and the actual games (which is generally very good), there's not really a whole lot of depth to your coach or your staff.
Being notified when your head coach leaves should be the absolute bare minimum.
I'd love to have the option to either follow him to the new school or replace him as the head coach. That's just barely above the bare minimum.
But I also want to look at the coaching staff of any school at any time and see their complete resume. Like, when you look at team rosters, along with QB, HB, and every other position, there should be a tab for the coaching staff, where you can open their "player cards" and see everything about them.
Often I find myself scrolling through coaching moves as the season comes to a close, and it'll say things like "record at current school," but it'll be the record they had at their *previous* school. But it doesn't actually tell you what their previous school was.
All coaches have an alma mater, but you can't always see that. It's a very minor thing, but it's just another piece of information the game includes but doesn't always let you see.
I also want coaches to have far more of an impact on their schools, with significantly more variability between great coaches, good ones, and bad ones. I wanna see the in-game version of Oklahoma hiring John Blake. I wanna see programs like Nebraska or Florida or Tennessee get an itchy trigger finger because their head coach "only" wins 10 games, and as a result they send themselves into a downward spiral lasting several years and several coaches. I wanna see a Top Story of "Texas is back!" after a 6-5 season, only for them to go 5-7. Basically, I wanna feel like the coaches are real.
In real life, the coaching carousel can be so chaotic. In the game, it feels like you can safely ignore it entirely and it makes no difference.
Unrelated to coaches but on the subject of things feeling real, I'd also love to see the inclusion of things like turnover chains/robes/etc. Put a bunch of real-life ones in the game, but also include a ton of customizable ones so we can add them ourselves to whatever team we control. And stuff like Hawaii's coaching staff wearing Hawaiian shirts.
So much of this game is so good. But it needs those little touches to really feel alive.