MGQ was discussed extensively when the Acceptable Content Scale was being devised, and in the course of those discussions it was agreed to stay.
It's pretty funny to meme about "Even Zach wants this one banned!" but Zach fervently wanting MGQ deleted isn't new.
I find it pretty disappointing any time people incessantly argue for a verse being deleted, seemingly hoping that this time, despite their arguments being the exact same, people will look the other way and let it be deleted.
If you want to find out why it was allowed to stay, read the dozen threads we've already had on this topic which have led to it sticking around.
EDIT:
This thread is the one where it was discussed at length, and the concept of the Acceptable Content Scale was formed. It was placed somewhere around a 3 to 4 but was considered okay.