It could also be argued that there is no luck whatsoever in pinball.
IF you make every shot you aim for (which is pure skill) you could never have the ball out of control. Certain machines you even can get to MB without ever losing control of the ball (SM, SS, WPT, LOTR, I500, WH20, T3, CP, ST, DM, TAV, WCS)
If you add the skill of live catching 100% of the time (which again is pure skill) you can add almost any game (from the modern era) into the mix.
Then add in dead bounce, post transfer, nudging, slide saves, death saves etc. and IF someone was able to not only execute these every time, but more importantly know when to use which skill at what time and that's when it is purely about skill.
I'm often asked when talking to noobs "but how do you save a ball that's going straight down the middle?" Paraphrasing Bowen, when he has been asked the same question "Don't let the ball get there in the first place". Basically meaning that if you hadn't made a poor shot just prior you wouldn't be in that situation.
It was Gary Player who first said "The harder I practice the luckier I get".
Luck has absolutely nothing to do with it.