well, random/troll/fixed results were always in the game.
But there are other, long term changes.
For example
- Almost about a year before, they tweak the engine so not to have those big scores of 15-0 or 10-0.
they still exist but only vs illegal positions, not vs abandoned 3* teams with players in a correct formation.
If your oppo is such a team, usually there is a top score of 5-0, 6-0.
If you are not watching such a game, any result is possible.
the way of fixing such results usually is with oppo GK super-performance or a very low efficiency (even if your attackers have X3 skills vs oppo defenders).

- Another change was back at November of 2017 with the new team set up.
We "lost" the red and blue arrows so the choice to give some intention to our players and the team.
Also with this free style of setting positions, we could see some "wrong" moves of our players (the AML & AMR).

What I observe lately is
- Less effect of orders
- Less effect of some special abilities.
Not that we could see them often but I think the icon/action of play-maker passing ,
the shadow striker and the corner specialist are more rare.

- Also many times I cannot explain the % of ball possession of a game.
Seems that some factors don't add to that.