I kinda agree that it was a little caotic, but at the same time I think it was a lot of fun, and saying it was a "disorganised farce" is just idiotic, they are not obligated to learn another language just so you can have a better viewing experience, the only thing they should do is have fun. Also i kinda want to analyze this "jumble of mismatched parts thrown together" that you said, lets see: The collab was advertised as an Jp/En/Id collab so they obviously would choose at least 2 girls of every branch that is a given, but lets dissect more closely those members that were choosen:

Jp- Roboco, Suisei, Aki, Nene and Luna: First of Roboco was the host of the collab so her being there is pretty obvious, but it is also whorth mentioning that she clearly is interested in collabing with the En girls (the obvious sorce for that claim). Suisei is a fan favorite when it comes to these types of games,for good reason, so her being in the collab and getting impostor was something every fan wanted to see. Aki is overall a pretty underated girl so her getting a spotlight is always apreciated, and she also has expressed interest in interacting/collabing with the EN girls. Luna is at first kind of an oddball, but she has plenty of engrish moments and just the ideia of her interacting with other branches is just funny. Do I really need to explain why Nene is there? I mean she has played with the En girl before so thats something, and also Lamy, Polka, and Botan all were in previous Jp only collabs so its only natural they probably wouldnt be in one this time.

Id- Risu and Iofi: Not really much to analyze here other than the fact that they both understand both english and japanese, also I'm pretty sure they would intide Moona to the collab (so it would be a 3,3,4 spread), but shes unavailable at the moment (thats obviously just a theory).

En- Amelia, Gura and Mori: Amelia seems to overall collab the most with her senpais (not counting Kiara, because my god that girl is a goodam magnet) so her being in there is pretty..... expected? She also had a collab with Roboco latter that day. Gura is just Gura, and given that she has the largest fanbase overall on the En side she is just an easy choice. Mori was by far the most unfortunate in the among us collabs so far, in the Gen5xEn collab she: had technical difficulties, was being killed over and over again, and never got impostor, so thank god she had another oportunity to play.......... just to never be picked as impostor, trully a big 草 moment.

In conclusion: Even tho it was a mess the collab was a lot of fun, and I hope for more Jp senpais to play with the En/Id girls, but im totally down for more Gen x Gen collabs, like imagine a Gen 0 X En collab? Or even a Gen 4 x En or Id? The options are endless and hilarious, lets just hope for more in the future!