Why is that confusing to you?
Combo execution is just one part of competative play, just because i enjoy to lab and practice high execution combos doesnt mean im automatically pro player or good at pvp or interested to grind all the other aspects to become one, like study all the frame data, grind out all match ups, neutral, gameplans , practice reads and reactions etc.
I play for fun and doing high execution combos and breaking combo systems and discovering its possibilities is also very fun and interestig to me.