Again, it's probably better (or worse, depending) if you didn't look at it from a "ONLY Kiara gets fucked over by Cover"-perspective. Basically everybody but a select few are on their own (and even the heavy hitters had their individual issues with corporate at times).
Most other Holos also have to spend their personal money and effort on their own projects, with Cover doing very little for them. So Covers uselessness is pretty universal all around, and not just a conspiracy against any single one.
As for Holotori vs Umisea, of course the organic friend group is better than the manufactured one, and that's not JUST our personal bias speaking. But looking at it "objectively", at least from the perspective of the pencil pushers upstairs who set this thing up, it's not unreasonable to expect that Cover will put its eggs into the biggest draws first. Hell, even as a bystander you'd have to hope it works out, because then maybe Cover will also throw other groups like Holotori a bone and sponsors a song or whatever. Or maybe not, and they'll continue doing things themselves, realistically they should be used to it by now and it's pointless to get angry over it when that's the way things go in the world.
Management acknowledged the pairing, mentioning it on official streams and such. Could they have gotten an even bigger push? Sure, but meh, am I too worked up about it? No, because what would we have even gotten out of it? Some corporate cringy shipping song? Some stupid couple show on the official channel? That would've only amplified and broadcasted their incompatible chemistry (as an actual "ship" pairing) for all to see and prolonged the inevitable. I'm happy they didn't get too much of a corporate push, because then they would've felt obligated to keep up the failing act for longer than necessary, and I much prefer that they have cooled off since.
>Kiara wanted to be a bridge for the JPs, they are wasting her talent in that area and are hiring more bilingual holos instead.
Hiring more bilingual holos is still a good thing overall, what do you think Kiara should stay the only JP speaker? This is a caricature of egg-think "Kiara wants to be special and is threatened by others taking her place as THE bridge", and does her a disservice. More integration between the branches is good for everyone, and Kiara shouldn't have to carry that all by herself.
Again, I'm all for thingscovershoulddo.txt, but I don't see what special treatment do you want Kiara to get? Yes, sure, Cover could do more to help with personal songs, maybe co-pay at least, and there definetly should be more activity on the official HoloEN channel to help promote the talents, but that goes for basically everyone, not just Kiara specifically.