The other question is how much content for the good path does Minthara even have? This might be another reason why Larian find her low priority.
And that is a horrible reason. It's time we stop excusing Larian for their obvious neglect and being biased in terms of how they’re implementing content. You're not required to play
entirely evil to get Minthara, but I can understand the disinterest.
The only thing you will ever miss if you
don't slaughter the Druid Grove is one romance scene, but that is putting it a little mildly as it is her
only romance scene at the moment. Without trying to spoil too much, I'll say that getting her through this path will give you a better foundation with her in terms of relationship. It is an intimate moment for her character, and she calls back to that moment a few times across the game, but this is only a few dialogue lines. If you
don't romance her, you're not really missing out on much.
If you defend the Druid Grove and recruit Minthara, either by knocking her out or using the Good Recruitment mod, you will only ever meet her again in Act 2 wherein you can choose whether or not to recruit her to your party. In this path, you can still romance her, she can still confess to you, and she will still have all her other lines and reactions towards what’s happening in the game but you won't get the romance scene.
The truth of the matter is: Minthara just does not have as much content as other companions, whichever way you get her. And yet, here I am and here are some other people being so passionate about her in spite of this. I think that speaks volumes that what's currently there for her is great, but it needs more polish. The longer Larian chooses to ignore her issues, the worse they look, and the new recruitment is already putting more attention on her.