I mean, I personally love that kind of RP, but it's not everyone's bag by a long shot, and most people just bitch and whine if you don't let them throw dice at things and not have to figure out how it works.
Oh shit, not bitching and whining. You're right, I'd forgotten what a compelling reason that is not to do something, my bad.
And that differs from anyone else getting a legacy how? You meet the initial prereqs and request it, and then every time you hit the shit for a new attainment you, like, update your note or whatever. Generous amounts of handwavium are often applied to this, just like with learning arcana, because nobody wants to go through all of the arcane tedium of trying to figure out how to make it A Big Mystery.
If somebody wants to throw dice at trying to figure out the exact requirements necessary to completely duplicate a Legacy without being initiated into it somehow, like I said, more power to them. Since you cut off the important bit for your quote, I'll restate it here:
More specifically, they don't want to ICly 'copy' anybody, so the idea of doing any of the above would probably put them off way more than just asking them to come up with a variation on the same.
They don't want to throw dice at it, even, because they-the-player just want their PC to have the Legacy. Why should they have to go experiment on a vampire to become a Tremere? Bah humbug. They'll just mysteriously become one, tada, because poof Legacy. Or want to get all of the exact same Attainments and shit, anyway.
Which brings us back around to: Something being technically possible doesn't mean staff has to, or even should, allow it exactly as presented. Just like your ST has the right to say no to a Legacy that will raise the bar too high (which, to be honest, would be a pretty fucking hysterical pitch given what's in the official resources) and tone it down, they've got a right to say they aren't going to handwave you just waving your hands and poof, gaining access to the exact attainments of a Legacy you've got no insight into IC.
There are a number of Legacies that even specifically call out the fact that if you're already a part of the Legacy and either can't or won't follow the proscribed methods for advancing that Legacy (such as because you've been ostracized, or it requires access to a specific item that you can't get your hands on, or whatever else) your only option is to split off into a variant Legacy by upping the Gnosis requirements by +1 and coming up with an alternative attainment. If that alternative attainment could just be the exact one you're being denied like it's no big deal, I'd assume that would get some mention, but it doesn't.
Which means, yet again, that I'm not going to be too sympathetic to somebody bitching and whining because they're not getting exactly what they want, when they're being a tool about it to begin with.
