It's presumably an EA thing though right, because I cannot imagine that when all of the Origin characters are in the game that you will have X companions all lusting after you simultaneously. Where's the option to simply have meaningful friendships (not to say they couldn't blossom if you choose) and swig some wine away from the overly lustful camp? Not all companions should hit on you at the same time, that or they should bloody well all get over themselves and be up for an orgy.
But yeah, EA surely? to test which relationships we were interested in character wise perhaps?
I think the end-of-act-1 celebration romances are going to remain in the game.
When I first found out that you it was accessible this early into the game I was a bit surprised since I normally associate RPG romances with something that happens way deeper into the game, often as a culmination of a NPC's associated storyline once you have a chance to actually get to know them.
Romances are, for reasons I'm not sure I'll ever understand, often one of the more popular aspects of RPGs (as is evident if you take a look at various fansites dedicated to the games, BG3's community hubs included) and I think the decision to have them available this early was done consciously to satisfy these players. The fact that Larian straight up made a dev blog about how the game was going to have animated sex scenes seems to further support this.
I wouldn't be surprised if the options currently available to the player are used to gather feedback and data such as which NPCs the players seem to like the most, but I don't think the early access romances are included solely for this. I think they're here to stay, but whether or not the relationships you form with the NPCs will evolve further remains to be seen.