A lot of modes and issues are neglected in favour of Ultimate Team. They've had the same clunky UI for about 5 years now and career mode is buggy as hell and takes you out of the realism when Harry Kane moves to Everton for 104m or some bollocks. There's no real way to have a proper youth team (can only select from a range of players 'found' and then they just sit in a list until you add them to your squad), managers never move clubs, you get stupid objectives to fulfill, etc... but every year they ignore things and add cosmetic new features nobody wants with buzzword names like 'Active Movement' which barely does anything different. They think adding more cutscenes to career mode will make it more engrossing, rather than, you know making it feel like a genuine career mode by fixing the underlying issues.
Then there's all the exploits when you play online. Pace is always overpowered, headers are useless so people in the game basically never cross in the air. There's just so many things left broken from game to game.