Comparing those two to Shadowheart's quest makes them quite laughable unfortuntately.It was quite disappointing that after you get Minthara to join your party, she doesn't have companion quest at all, not even smaller one. It's not for lack of resources, cos there alot of stuff in game.
I think they count the optional companions' joining requirement quests as their companion quests. Halsin's only "personal quest" is the one to get him to join.
Well, in a sense that's true for almost every companion. Shadowheart gets massively more content than any other character. But I get what you're saying, and you're not wrong.
Jaheira as the other optional companion also has very little quest content, her quest is essentially Minsc's.