But shots to goal ratio doesn't tell you everything either. Any player can start thumping balls from 30 yards out and that doesn't help the validity of the stat when it comes to converting good chances. What I've been telling you from the start is that there are many more easy chances missed than in real life (not even mentioning clear cut chances as they're broken as you've stated) but just watching the matches and determining with my own eyes what are easy chances, my players rarely convert. And since you have produced no conclusive stat (as admittedly, it is very hard to come by unless you're a data analyst for SI) you cannot argue with any certainty that my statement is incorrect.
The fact of the matter is there are far too many easy chances such as one on one opportunities missed. But as this argument will go nowhere it might be worth ending it right here.
Thank you all for your help. Happy FMing.