It is to prevent the hard core from purchasing all their gear day 1.
If you look at it from the big picture. Yes, it is an annoying and arbitrary time/activity gate, but the overall time for a fresh character to level 30 is now significantly less. It acts like a deminishing return for longtime players, but a boon for the new. Just a way to squeeze the merit gap for new content
I really doubt that will be true, and the non-RNG time from a fresh player to Level 28 with weaponry capable of doing the raid has probably just gone up by at least a third.