Honestly, would anyone care about flight if it wasn't in Solasta? The majority of CRPGs don't bother with a flight system and nor did the many D&D implementations on PC I've had so much fun with.
I don't have a problem with them adding it, but I feel like they'll add something which will be a flight tag that just lets a character ignore most terrain and possibly get knocked down. People will have been instead expecting some hugely complex system and includes different levels of altitude and all other nuances and we'll just have the same exact threads about how the flight system is insufficient.
I think before Solasta, no. But now that I’ve seen it, I’d like more verticality in games. It does change things up. It’s like you don’t know what you are missing until you see it.
I think we won’t see any sort of flight in BG3. I don’t think the engine can handle it. I always thought the harpy fight was odd and their movement looked dorky. But I understand the limitations of this engine and I still wish there was some sort of flight mechanic, even if it’s limited.