RCs should IDEALLY not have breaking changes. You can dice it up any way you want, but it wasn't a final build and there were obviously some rough edges.
Angular 2 is final now and they've committed to no more breaking changes until the next major build (at least 6 months away). If s/he started learning with it today, then ~90% of what s/he was complaining about in this post wouldn't have been a thing. That was my only point.
Not that I find the debate particularly productive, but "there will be no breaking changes" doesn't mean "final", it usually means (at most) release candidate. Or even beta. While "it works but we might still introduce breaking changes" is not a release candidate but maybe a technology preview.
Angular 2 is final now and they've committed to no more breaking changes until the next major build (at least 6 months away). If s/he started learning with it today, then ~90% of what s/he was complaining about in this post wouldn't have been a thing. That was my only point.