This right here is a gem.But Im not discounting your point. Which is most any human is capable of 5.0 tennis if the work was put in and the time. But we need to be careful when using pros as examples in these discussions. Much of their success & trajectory just doesnt apply to the common player.
The fundamentals of technique apply from the pros on down, but most of what the pros do that we see on TV just isn't relevant to our games.