This is one of those positions that I think seems reasonable in theory, but isn't a sensible position in practice. Lefties do have an advantage, and it is asymmetric, but that doesn't mean it gives the same scale or effect of advantage. Plus, playing left-handed is (generally) not a choice, and there's no sensible option to ban left handers (not that I want to see pips players banned either, but you could ban pips rubbers in practical terms, if you see what I mean).
If I see a leftie push a ball, or a penholder, as a newish player with decent exposure to "standard" rubbers I can make reasonable assumptions about what's going on, even in the highly unlikely event that I've never seen a left handed or pen player before. The disruption effect of LP is that, all things being equal, the ball is now doing the total opposite of what you would expect. This is a far bigger cognitive jump for a player to make, when compared to the other options you give. So it is, and always has been, a question of the scale of the unusual effect a player must negotiate. This is why, for me, the frictionless ban was important, but banning pips isn't necessary. We all have our opinions on what level of madness we deem acceptable. Banning left handers = obvious bonkers proposition. Banning pips = half-understandable response to frustration of players who are new-ish to the sport, but hopefully not given serious consideration by the powers that be.
And sure, if we close our eyes and imagine a player who has access to all the resources they need to adapt and adjust to playing pips players in their early stages but chooses not to put the effort in, then fine. They suck, we should totally ignore this very specific player who fits this exact characterisation. But in my experience, in the real world, most of the people who struggle with pips are juniors (or players without a support network) and it's a battle for the coaches and clubs to overcome. And they do overcome, with positive support and the right kind of training / encouragement.