Or ... here's a thought: Larian would not have hired those people in the first place (or not hired as many of them, or not given them as many work-hours), and instead hired/funded more people focused on the other aspects of the game. That's how production works, not just in making a video game but in any economic enterprise.
And as I said above, there are limits to the number of people who can work on the same thing at the same time. That is also how product development works in general.
The assertion that scrapping romance scenes would have meant addressing technical problems quicker is entirely dependent on whether Larian left the core programming team understaffed so they could blow as much as possible on everything else.
I think that is highly unlikely as they would be amongst the most key roles, and I’ve seen no evidence to suggest otherwise.
Edit: Although they apparently don’t have the resources to fix this G Damn forum.
Animation are subcontracted. Doing less thirsty romance animations does not mean that someone at Larian now has nothing to do but that less money is paid to a other company where Larian ordered animations from. That money would then be available to hire additional employees, push the release further back to have the existing employees work for longer on BG3 of, if you have to use it on animations for some reason, order different animations that are more relevant to the story or a new companion (or some non-sex Halsin content).
My feeling is that removing romances from the game wouldn't have actually made anything better. Maybe there would be a few less bugs, but I don't think it would have freed up nearly as much money as people think it would have. I think that fundamentally, the reason the game is the way it is comes down to mismanagement. A team that's rewriting major plot and character details in the last year to several months before release of a game with this much voice acting and animation is not a team that's organized themselves well. Frankly, if just removing the thirsty romance scenes really would have let them make significant improvements to the game, like fewer bugs and more late game content than just a quest or two, that actually implies even worse mismanagemnet. If that's true, then removing romances wouldn't actually fix anything, because they would probably have just found something else to blow the money and time on.
I think that the issues we see can be traced back to the last-minute story changes that were made, which necessitated lots of new animation and voice work, and to Larian over-focusing on polishing early access content and then running out of steam as they made it to act 3. Frankly I think that the game probably would have been better if they'd focused more on character content and stories from the beginning. By that I don't just mean romances, I mean making the central plot of the game more a background element to provide momentum when needed as opposed to constantly being pushed to the fore. It really seems like companions and NPCs and side stories are what Larian gets most excited about in terms of writing, and it seems to be where their talent really lies, because that's consistently the best written content in the game and I think that with some exceptions, the game does deserve the praise it gets in that respect. So playing to their strengths would have probably led to a more coherent experience overall. And one I'd probably have enjoyed way more, personally.
