Honestly for me, while I don't like the UI and agree that it's not good I could definitely get used to it. What irks me is feature removal. I miss getting more detailed stats during and after matches so much. Heatmaps, pass maps, touch maps, dribble visualisations, average positions, shot maps... All gone.

Also being unable to do much with your reserve and U18 teams. I don't think you can even see their position in their respective leagues anymore? You used to be able to micromanage them, select specific players for specific positions (useful for retraining which I do a lot) etc.