Hold on, now we've gone from "there must be more true friend companions" to who fits in the "waifu" category or not? In that case, there are many many harem games with fantasy settings out there where the writing might be more to your liking.
And we've gone from wanting true friend companions in the game, which should revolve around character backgrounds and personalities, to it mostly coming down to how they talk?
Taril already covered most of the situations where Lae'zel and Shadowheart definitely aren't unique in demanding things, and especially in act 1 depending on choices you will absolutely have companions leave you like Wyll, Karlach, and likely Gale too. Shadowheart, Astarion and Lae'zel are the most amenable in that respect in that they go along with both saving the grove and destroying it. Astarion will be bored if you save it, but that's about it. Wyll and Karlach will just leave if you destroy the grove and Gale needs persuading to stay.
I've listened to some of the voice-swapped samples of the mod you linked and while parts of the changed voice samples do sound good, personally it just feels icky for me to use AI to modify original VA work to make it fit a different gender. Feels like that's a scenario where you'd need original VA permission to alter their work, even when it comes to free mods. Beyond that though, simply changing appearance and voice doesn't make them a different character. They're still the same personalities and (almost) all of them are guilty of many of the same behaviors you're so aggrieved by when it comes to Shadowheart and Lae'zel.
