You dont get it. If enough players would experience cheating (NOT HACKING), then they would have to adress it and insert proper anticheat. How do you think any shooter game on pc platform survive? It just takes time and effort. Any popular title that survive get rid of this problem by time. Not entirely since it is a endless struggle, but enough to make it a minor problem.
One example is Apex. In first season and 2 other times, the new cheating software gave the game a influx of cheaters. Then the developers have fought this constantly banning hundred of tousands and now you very rarely see anyone cheating. Same story about Battlefield 1.
So crossplattform would mean that the cheating would get much more attention and something EA could no longer ignore and it would just mean a much larger player community and more fun for al in the end.