As someone who will likely never do an truly evil play through but is also an overenthusiastic Minthara enjoyer, I honestly really like the current difficult choice you have to make in order to impress her. Just from my own character's weird RP perspective I like the idea of making bad decisions for someone you love. But personal preferences aside I would also love to see more content for Minthara and if the community or Larian themselves can think of (and have the time to create) an alternative route to having her in your party I'd of course want to explore it because it just means more replayability for me.
Some spoilers at the bottom for Act 1 & 2 Minthara stuff.
I actually don't know what happens if you don't go the current path since I sided with her, but I imagine a situation where you just.. don't kill her (because how is she going to find the Tieflings without your interference anyway?) but kill the goblin leaders instead you'd eventually just meet her in Act 2 the same way you do when you side with her and save her all the same, just a less impactful version of it because you didn't get to know her in Act 1. I think there should still be extra more intimate (like, in the form of cute dialogue) content for siding with her from the beginning.
Right now I feel that Act 2 Minthara is written in an underwhelming way and could be better with a slight rework anyway. Give me nuance where she feels extra vulnerable or confused knowing you saved her despite her literally attempting to kill you, or let her reflect on how she wasn't herself when she slept with you at camp after the battle and have the player character work to win the real her over. She's such a good character I really want to see her personality expanded on more.
