I've defended the storytelling in this series in the past, but I'll admit this ending is a bit annoying.
It seems very likely it was rushed for some reason, with tmnr abruptly changing course to tie things up in only a few chapters (cancelled by magazine, other commitments, who knows?)
In that context the supporting characters and secondary plot was always going to miss out so I won't dwell on that (got more than I expected there with the first part).
Looking at the broad strokes it was done pretty well, trying up the main issues in the Uta-Kaoru relationship - Kaoru's divorce and independence, confessing their feelings to each other, and in the final chapter both of them doing the self-discovery/independence thing, but still returning to each other.
Obviously, the rushed condensed end has missed opportunities for years of subtexty slice of life moments, but that was unavoidable in the frame of tying things off quickly. I don't really see the complaint about Kaoru's sexuality either - we never expect women in relationships with men to "prove" that then can be attracted to men, why do we expect it of wlw? Kaoru never said Uta's gender was a problem, only that she couldn't answer her feelings.
The previous chapter made it clear that if they saw an opportunity to live together they would take it, so that doesn't really need explaining either.
My main complaint is about the lack of clarity in the ending. I can only assume the ambiguity was intentional, but if that is the case it feels like they couldn't even commit to ambiguity properly.
It would have been easy to end on an ambiguous "where will the future take them?" note as in the previous chapter, eg ending when they meet again after the first time skip and agree to live together. But the second time skip is so large (apparently several years - Uta seems to have graduated and been working for some time) that it is unlikely they haven't reached some sort of resolution (or at least another discussion)... "where to now...?" has been replaced with "It happened, but I'm not telling you what!"
The chapter sets up an very strong presumption that they are together - Uta resolving to hold on to her feelings, and the framing of Uta and Kaoru in the last scene, with a strong "welcome home hubby" vibe (seriously, who waits listening near the door to eagerly greet their "platonic roommate" when they are late home).
Failing to commit with that sort of framing makes it feel like "plausible deniability" more than true ambiguity - which makes me wonder why. Is ex-sister in law that controversial (seems unlikely), or are the anti K/U fans that much of a factor? (certainly I see some Kaoru hate here, and some SJWs that would cancel the series on the basis of age-gap if it got romantic).
I've come to expect plausible deniability from non-yuri stories indulging in bating (Japan seems to have a bit of a genre cringe about putting confirmed same sex relationships in gen stories), but getting it from a yuri story leaves a bitter taste.