Just because a bunch of very good players manage to counter luck with skill it doesn't mean luck doesn't play a role.
If you don't like the term luck we can use the term random. Crate drops are random and therefore there is an advantage or disadvantage in every turn. Those adv/disadvantages can be countered with the proper use of hidings and strategy, but that doesn't take away the fact they do exist. They can be countered with skill and be made a non factor, but that neither means they don't exist.
Anyone whose been roping for some time can't lie and say they've never been screwed up by crates in what they consider a flawless games by themselves. It doesn't happen often, it doesn't happen often at all for good players, but it happens unlike other schemes like RR where if you lose you only have yourself to blame.
Just because I'm good enough to grab the hardest crates turn after turn doesn't mean luck isn't having an impact, as I am using more skill to achieve the same my opponent achieves, with easier crates, and whilst even if at the end I win, it still took me more effort, why did it take me more effort? Random.