Preface: I support this feature, though I doubt I'd use it personally.

Whilst I'm admittedly not as active in or embedded in the intricacies of this community as much as yourself and others, I actually did not notice this newbie influx until I saw your previous post and went searching for it. That is probably most likely as I rarely follow global. But isn't that the point? If you want to see your curated content without the migrating redditors that you find annoying, then stick to your own feed. If you decide to check global then you run the risk of seeing content and/or posters you don't want to see. Much like going on reddit when you're not signed in and seeing all the drivel posted in the defaults, thought not to that extent.

Also, there's a factor you're ignoring in all this: you. Newbs and their post aren't inherently annoying. Sure, they might not totally fit in, they might not get the culture, they might not be properly assimilated, or might misstep through ignorance. But at the end of the day, it is you who is choosing to be annoyed. A state of annoyance is not some sort of constant that you're fighting against, it is a state you can choose to relinquish if willing. If you decide to stop being annoyed the whole issue evaporates. Of course, there's people like 'teamramonycajal' who really just don't fit in and make no effort at all, but for the most parts it's just newbs being newbs.

But yes, I am not against this feature if others think it'll help the whole community run smoother. As aforementioned, I know you're a much more prolific on this site than me, so there's every chance I'm just not being exposed to what you're defining as the problem. However, for me personally the whole thing is a bit of a non-issue.