Did any one ever play the FIFA Manager series?
It was discontinued in 2014 but it was a decent football management sim, not as good as football manager/championship manager but it was still pretty detailed.
All EA need to do to make a good career mode for Fifa 20 is basically port FIFA Manager 14 across. Update, polish, change and add a few bits and obviously let us play the games (unless you prefer simulating and watching... which is what those games were designed for so bring that back) and you'll have an infinitely better career mode without too much effort. And EA already own the IP for the game I assume so don't see why it wouldn't be easy to utilise it.