You don't think about and try to remember theory during a fight. Yes I can protect all of my gates simultaneously because I'm quick enough to.Ideally. I think everyone would agree. But this is the problem with setting up a whole gate theory.
Sitting with a guard on center and mentally dividing space into 2, 4, or 6 gates times inside or outside just leads to thinking and hesitation when you have nanoseconds to respond with the correct hand technique to the correct gate, even if you've trained responses to each gate a billion times.
Even if you aren't thinking about this gate or that gate when fighting, it's the fact that you're open from all sides and can't predict what the opponent is going to do.
No amount of training will make center guard + gate theory an intuitive method.