I have seen some questions on dynamic difficulty adjustment go unanswered. Some moderators swear it doesn't exist, even locking threads in response. There are also articles online where EA says it just doesn't use it. 

If that is true, then it would seem to me that EA Sports still needs to answer why the game changes. And I don't just mean individual games of football where momentum swings, but also the game of FIFA 20 itself. (Or does DDA only refer to in-game changes while one team plays another?)

My own experience is that of  improving over the course of a few weeks and doing quite well one day, to the next day, with the same team, seeing how much slower those same players are. It gave the opposition an additional three minutes of extra injury time beyond what was allotted to continually reset possession. It started calling more fouls on me. It allowed the opposition to manhandle my players, even players on the opposition for whom manhandling just doesn't make sense. Opposition defenders can also run backwards faster than my strikers. It has also added lag time when I tell my players to pass, so that they wait until it is no longer a good decision or they are basically just running into an opponent multiple meters after I already gave the command to pass. And they now do things that I did not tell them to do. 

The game has become not fun overnight. Literally, Friday it was fun because I was learning (won the FA Cup with Huddersfield, the Scottish Cup with Motherwell, and was demolishing teams with Leeds) and improving and Saturday it decided to have the controller go haywire every now and then and make all of the other players better than my own. I thought that it would adjust and become more difficult, but it seems like it is doing it in a very silly way. 

Is this how it is supposed to work?