Okay, this is just a general opinion, and while it was prompted by Polefit's comment, that was just what reminded me, not what I'm really arguing against. Pole twin, you know I think you're awesome. I'm mainly putting this here to give my perspective and hopefully help sensualscimitar with making judgement calls and student retention.
I'm sure for a lot of people it's true that poor grip strength is just a sign of poor strength over all. But honestly, if someone had insisted on making that kind of judgement call with me, I would have been straight out of their studio. I have not-great grip strength (never have), combined with very sweaty hands (which for some reason people with dry hands seem to think don't exist). Well, actually I have sweaty everything even in winter, butd I don't know how I can improve the grip strength of the soft section next to my shin bone for a better knee hold.
Here's the thing: I can only do upright split grip and single hand grip work on spin mode when the pole is cold, but as soon as it or I warm up I can't grip any more. But, I have the strength for air shoulder mounts, ayshas in all grips (except Chinese...yet), one handed bow and arrows and I'm only about 15 degrees from an iron x. So does my lack of hand grip really mean I should still be doing scoprios and geminis over and over and over because I'm not "ready?"
Sometimes I feel like there's this little bit of exclusivity where people say "If x happens, you're not ready to progress, if you have x problem, you're not ready to progress." By some people's standards I should not be inverting at all! But, I do invert, maybe a hundred times a week and the sky has not fallen in, and my injury rate is the lowest of any physical activity I've ever done.
And sometimes, the "you're clearly not ready" comes across as condescending (this is other threads and forums, not this here!). It seems like a way of keeping new polers on the outside, by constantly jumping in to tell them they're not good enough to belong. (Polefit, I know you weren't saying anything like that at all, I was just reminded of others doing it).
And for some reason, sweaty hands (if people even concede that they exist) and poor grip strength are the biggest targets. Do people say the same thing about poor upper thigh grip? Getting dizzy on spin mode? Not having basic acrobatics skills like cartwheels, handstands and backward rolls on the floor? Because I have never had any of those problems, and can't even really relate to them, simply due to having the good fortune of having large thighs, vestibular hyposensitivity and over 20 years of gymnastics and similar sports experience. Still, I don't think that people who get dizzy or queasy on spinning poles really should work on their aerial awareness before they even think of learning advanced tricks on static. I think they should just learn what's right for them on each pole.
I do grip strength exercises every night, I ignore the people who tell me that using antiperspirant grip aids is "cheating" (using grip aids is the only way I can get enough grip to actually build my strength until my fingers and forearms ache) and I force myself to work on poles that I have so much trouble gripping it causes physical pain (50mm spinning chrome in humidity!) . But if someone were to look at me and say that I'm not allowed to try skills I know I'm perfectly capable of doing, I would leave that studio and never come back (after crying for an hour, but that's just me).
But by the same token, I know others would be fine, or even prefer that approach and they are certainly welcome to keep attending this hypothetical studio!