i finally figured out what makes early rwby feel different to the later volumes. it comes down to how the volumes themselves have been constructed, and how early rwby set expectations that the later volumes didn't exactly meet.
when you look at V1, there are very clear story and / or character arcs with set episodes. there's practically zero overlap; the initiation is about the initiation, the badge and the burden focuses on ruby and weiss, jaunedice on jaune, and the last two episodes on blake and weiss. each arc solves its "problem" within it; for example, after the badge and the burden, weiss doesn't have a problem with ruby being made the leader, two episodes and one in-universe day, and the problem has been solved.
V2 moves away from this a bit, but not enough for the "this character gets the focus for this specific arc" angle to completely disappear, more so the problems aren't solved within five minutes; team rwby's investigations didn't stop blake's situation from getting worse. the writing is still focused on specific characters and their development, leaving others to wait for their turn. . . though you do get a bit more of setting things up for those in the waiting room.
V3 is centered around the tournament with very little room for actual character development to take place, prioritizing moving the plot forward.
V4 and V5 take a bit more on their plate, but thanks to the main cast being separated, you still get the "this character gets the focus for this specific arc" feeling from it. this effect lessens the more reunions there are, but blake practically has her completely own story for 99% of the time.
from V6 however, this changes. the gang is back together, the plot is on the move, and there's no room for more episodic, character driven and focused arcs. every character should get something to make their presence justified, but with limited time available it's never going to feel enough compared to the early days of the show.
so, those who through V1-4 were waiting for the story to get to atlas so that weiss and her family could get their time in the spotlight, playing the central role in specific episodes and such, are left disappointed when the focus is given to fresh faces and storylines with no prior set up.
and when not that long ago blake got two whole volumes for her story with no one else upstaging her, weiss' story getting crumbs while the writers introduce relationship troubles for ren and nora out of nowhere is going to sting. to be clear, this isn't just about these specific characters, this feeling applies to the whole show in generalāand might also explain why there are complaints of characters getting "too much screentime" even if their screentime in specific volume isn't much; they've already gotten their slice of the pie earlier, and any more is going to stand out against those who've gone neglected.
that's not to say the writers should have stuck with the V1 level of writing and focus on characters, some overlap was very much needed. but it does help to explain why fans were left dissatisfied with the handling of some characters and their storylines, as well as where their priorities lied; it didn't come from nowhere. the writers, unwittingly, set expectations they couldn't follow through with, mainly due to the amount of characters they decided to juggle at once.
there's only so much you can slice a pie before people are getting nothing.