I mean, more kisses would not be rejected by the part of the playerbase that stayed around for the romance. It wouldn't really make sense to give the same amount of variety to everyone, though -- Gale is a fairly stable person, for example. He doesn't need 2, 3 or even 5 sets.
Additionally, while Astarion may have gotten two sets of kisses, SH really is "God's favourite princess" coding wise -- flags and triggers and bugs galore, oh my.
The people not pleased by that suggestion (more kisses for every companion) are probably those like me who would like an all around better experience. Fewer bugs, smarter NPCs, a more fleshed out evil ending, etc. I'm at a point where I do not want more SH kisses: I get rid of her upfront in Act 1 when I don't want to kill the Nightsong, because I don't want to deal with her bugginess. Shar finally punished me for this transgression with the elevator glitch. Joke's on her, it didn't get my entire party!
