As I said in my second point, ignore Salah's reaction and look at what Dummett done. How is pulling Salah's arm not a foul? It's not natural contact between two players, he's made a conscious decision to pull him back.
And while I agree there's a problem with players conning the ref, I've very much of the view that officials have doubled the problem by being scared to make decisions unless they're forced to. Anyway, we've got VAR coming next season - I'm sure that'll be fun :/
Yeah VAR.... kind of needed but probably be another nail in my coffin of football enjoyment when the game stops and starts all the time. Football isn't really a sport suited to it despite the need for it, not sure what the solution is mind.