I understand your issue with that scene but I still think a toggle would be best. That way everyone should be happy, those who want immersive cut scenes and those who want immersive camping in an unsecured location. Maybe I play too much of survival games and have very cautious characters in DnD, but I would happily give up one bite scene (if I even let him do that) and sex scenes (that I will mostly skip) to have something that makes sense the majority of the time. If they end up adding the Xanathar's rule then I will take the penalty or switch to light armour to sleep in.
I do wonder if for the bite and the sex scenes that removing the armour could be a part of them, or cut to the undressed part. Dream scenes also should be part of the toggle option, of course I think any forced "romantic" stuff in these will probably be unarmoured whether we want to be or not.
The sex scenes fade to black, but they're kissing and laying down on top of one another etc. still in full armor (and helmet if you haven't turned that off) and it's genuinely just a little off-putting and ridiculous. My whole issue with the armor are these scenes that are negatively affected by it. If you choose not to romance any companion, then you won't see the scene anyway.
And when Astarion bites the character it glitches like crazy because they just merge together a little because of the bulky armor getting in the way. He still "reaches" the neck, but pretty much by the game glitching and his face sinking through the shoulder plate. And let Astarion eat, you villain! :') He's not mean hes just hungry.