Incorrect. Luck can't be "quantified," as in put on a scale and measured, but the effects of certain aspects of the game, which happen to have a large measure of luck involved, either have effects that are far more gamebreaking than other luck-based aspects of the game, or are significantly easer to setup than other "luck-based strategies," and as such are banned. Everything banned at the moment has not been banned just for "introducing a new luck element into the game;" it has been banned for being overpowered.
Consider OHKO moves. They offer a one-hit KO, regardless of the defenses of the defending pokemon, or the attacking stats of the attacking pokemon. Smogon PR ruled it still to be too powerful, however luck-based it is, to be unbanned in standard play. Consider Inconsistent. That's hardly luck-based: if the Inconsistent user switches in on something slower than it is, or something that can't hurt it much, it is almost always going to win the match, unless the opponent carries some ridiculously inviable check. As such, it was voted to be overpowered by Smogon suspect voters.
Evasion was similarly found to be overpowered; its effect, making moves miss with such easy setup, along with the ability to Baton Pass the effects, was found to be overpowered, and thus banned from the standard metagame, by Smogon PR. The difference between these and other luck-inducing factors is that the banned items were voted to be overpowered, while other aspects of the game which involve luck, like the aforementioned No Guard DynamicPunch Machamp and critical hits, weren't voted to be overpowered. If it's broken, it'll (hopefully) get banned, but not because of the tenets of any weird philosophy over banning which you seem to believe that the majority of Smogon's community holds.