Pretty much agree with everything you add, MrFuji ^.^

The party night is absolutely an issue of poor writing design creating a visible problem that otherwise wouldn't really be one. - To add to your points, even the ones that you haven't drawn the attraction of ALSO snark at you for failing to do so - it jumps into the dialogue as soon as you address them, without any player prompting. It's pretty egregious.

In Wyll's case, regarding his tastes, you're right - Mizora's form most likely shows a strong preference from him (though it could be a strong preference of hers, if Wyll doesn't have a strong preference of his own), but at the same time ,and this may be uncharitable of me... that''s a degree of nuance and understanding of realms lore that I absolutely do NOT expect Larian to have. They just went "succubus sexy lady lol" and called it a day.

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tl;dr: It'd be nice if some of the following happened:
- companions alluded to past sexualities or made more obvious mention of their attraction to Tav before The Night
- companions who didn't typically go for [gender] romances made some mention of it when romancing/being romanced by Tav and/or
- some companions had set sexualities, which was then used for opportunities for characterization/development. (note, this requires 8+ PCs to have a good spread of gender-sexuality spread)

Absolutely agree here - if the spread of options is broad enough, characters with locked preferences becomes more feasible. My only thought there, and the reason I defend playersexuality here, is that we're not going to GET a spread of optional romance characters broad enough to support that.