Quoting me out of context, that's really quite nice.
It is perfectly reasonable, under RAW, to teach the Gentle Gift, I'd even go so far as to say it's possible before Opening the Arts. It's not something I'm terribly fond of, but Matt Ryan made a compelling argument. Of course, no one bothered to point out at the time that I wasn't correct, one of the Criamon paths has a method for gaining the Gentle Gift, but that's a Mystery Initiation, and not exactly on point. But let's stick to the matter at hand, shall we?
The necessary SQ, 21 to teach a major Hermetic virtue, when no other Hermetic Virtues are present. It's pretty hard to get to a teaching SQ 21 as a magus. Let's start off some obvious bonuses, constant +3, single student, and Good Teacher, which adds 14 to the SQ. We need to get 7 more out of Com and Teaching. Com 2 and Teaching 5, Com 3 and Teaching 4, take your pick. So now he's taught the Gentle Gift, and didn't impart a flaw. It only gets worse for anything else to be taught, especially another Hermetic Virtue. And I was wrong before, but, One Shot, you were kind enough not to point it out, it's +9 when teaching a Major Hermetic Virtue. So now the next Major that a prospective student might want is going to require a SQ of 30 without a flaw, 27 with a minor flaw, or back to 21 with a major flaw.
shrug I think this kind of school environment could be in response to the mundane world encroaching on the magical places, and it wouldn't be unreasonable to see it setup in some of the more well settled Tribunals like Normandy and Rome. But again, it's not playing fast and loose with the rules. It makes other things much harder to pull off, and I'd still stick to the limit of 10 points of virtues and flaws and the free House virtue, until they get involved in a Mystery Cult...
Going back to my point, it's not playing fast and loose with the rules, it is, explicitly in the rules. And if that choice is made, to teach all the apprentices the Gentle Gift, it just means that it will be harder to teach them anything else. So what?
Probably most importantly, in this setting, what's in it for the teachers? These all have to be magi who are Good Teachers, high come scores, and a significant amount of teaching ability, and they also probably have to have the Gentle Gift themselves (even the ones who teach other Major Hermetic Virtues later on in the curriculum, because their students won't have Parma, and will be affected by the teacher's Gift). What is their motivation for teaching in this setting. They certainly don't get a lab slave for up to 45 seasons in exchange for 15 seasons of teaching.