Team Fight tactics is ...picking the best composition then..your skill comes into play.

1. picking best/op comp
2. getting lucky enough to get said comp
3. being lucky enough to get items worth a crap for said comp
4. after rng has blessed you, not the slightest bit of skill comes in (positioning, economy etc)

Your wrong . picking the best comp is the skill. After that comes rnd. Why games never will be a esport.