Unexplained mysteries

1) why do disconnected players gameplay exhibit very minimal switching and reaction times that are not aligned to card stats?

2) why do autoplay or disconnected defenders with zero training defend like gods when my 12 trained ferdinand with 100+ defending stats doesnt do anything matching that stat??

3) how are opponents doing skill moves with a sprinting speed in the box and my defenders just sluggishly trail them?

4) why are key input delays so unpredictable? The hard tackle happens with less delay than other commands.. this makes that skill move half useless. The tackle is also targeted at the balls current position and not its predicted position (as a real life defender would do)

5) 1 out of 2 or 3 times my defenders are not jumping to defend crosses. Or they jump late ot jump in the wrong direction.

6) why are all the 90+ ovr cards so low on stats, and very comparable to the 86 to 89 cards? Even with basic 5 training they are still mediocre at best. Whats the point of any grinding?