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've wanted flight in game since before Baldurs Gate 1. I get why it's difficult to do but it's such an amazingly cool ability there's never a time where flying would make sense that I don't want flying and several times where flying would not make sense and I still want flying. I'm always prepared to accept it's not included for good reasons but I still want to fly.