I wanted to do this for a few days to prove how passing in FIFA 18 is a pointless stat and to show that passing is way too easy and assisted. I decided to play with a team of goalkeepers (with 21 chem) and just play to win and see what the pass completion % would end up at. I believed it would be around 90% and that turned out to be accurate. When I compare passing with goalkeepers to regular outfield players I noticed no difference. Toni kroos passes with the same precision as Jack Butland and co. The passing stat literally means nothing.
Something else that you can see clearly with this is how effective counters are so it's no surprise this is the main tactic in FIFA 18 as you don't even need to be good or have good players to achieve this. EA fix your game none of this should be so easy, people are bored because of the lack of skill required.