I’ve “trained” in mock combat for decades.
99.9% of it was exactly that! “Mock combat”
The few times I’ve had to flex that muscle memory, it did not end well for the person who engaged me in actual combat.
Part of my training was avoidance, you win every fight you’re not in!
However, once engaged, you have to fight like the third monkey trying to get on the ark!
And when you already know weak points and pressure points…. It becomes an easy fight.
Edit, my training was in hand to hand and mid evil weapons like daggers, swords, and pole axes.
Square off against me with a knife, and I will expect to get cut….
However
I will bleed onto your corpse as you die from wounds inflicted by your own knife.
Shall we dance?
Good training improves your performance.
That last line says it all:
“Dedicate a good portion of your training to what you’re bad at, and you’ll grow.”
That explains why people watching me train think “he’s really not very good”. That’s because I’m training what I’m not very good at 
If you are good at it you are not training hard enough.
Bill Drill - is it under 2 seconds?
Mozambique drill - is it under 2 seconds?
Draw from the holster one round on the target - Under 2 seconds?
All in the A zone? That matters!
My weakness is my weak hand shooting. The Dot Torture Test verifies this. This is what training and practice is for.