I don't agree with you about Keikki tbh. I pretty much agree with klash when he says manual doesn't make the game be a sim. Like he usually says, manual just makes an arcade game harder, nothing more than that, and I agree 100%.
You can make tha game "look" more sim with manual if you want (and that alone makes the game more fun and satisfying to play for most of us), but you must realize that all you have to do in Fifa (even with manual) is trying to attack quickly looking for your strikers and wingers (don't know if I spelt it right). There's no midfiled play in terms of passing (I mean, lateral passes/passing the ball around the midfiled), no need to work with the ball in possession patiently, and that is due to the crap Ai with bad defence reconvering (midfield tatical recover/ defenders dropping back) + the stupid idea from the ai to pressure and then run out of position, and also letting so many unmarked players. The result of all this: counter-attacks after counter attacks, and with assisted settings you just need to pass BLINDLY (180°passes included) forward with many 1-2s with just a tap on passing button.
To summerize all this stuff i've just said, fifa is all about counter attacks after counter attacks, and assisted (compared to manual) just give you the advantage to play blindly and incrible fast with just taps(0 user skills).
Sorry for my english.