To be fair, AC romances seem to be more "quick flings" anyway. Going by what I've seen in Odyssey and now Valhalla so far, you get to have a "first date" with them, from then you can occasionally go back and kiss them or bed them (same 2 short cut scenes), they greet you differently, and that's it.
Now, I'm only 1/3rd into Valhalla, so there might be more here later. But I don't expect it has the magnitude of romances in Mass Effect, where you had several "dates" and a loyalty mission.
I'm not criticizing, just comparing different approaches. Assassin's Creed doesn't have companions in the Mass Effect sense that you take on every mission, level up and need to make loyal as a mechanic.
AC's romances are NPCs that accompany on a few specific missions, and otherwise stay in their "vendor booth". You don't see them as much, so having more superficial romances makes sense. It's just a fun way to get replayability and an extra side quest, and anoint your favorite NPC.
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