The problem is not about difficulty at all. When I play a fantasy adventure I want to play sword and socery and not pit shoving and barrelmancy.
For me the current combat system is utterly without soul and fun. It is a silly puzzle solving game paired with spamming of the same spell/action again and again.
I wouldn't care if they threw the D&D 5e System comletely out of the window and created something that I can enjoy.
But currently the bare bones implementation of the 5e combat system in Solasta is about 10 times more engaging, tactical, interesting, challenging and fun for me than the Baldurs' Gate system.
You know Solasta seems interesting. I like the level of detail across the board. My biggest complaint is the lack of multiplayer. That seems like a huge miss to me - to create a system that interesting and not build Multiplayer in with a robust DM mode. I know they plan to have tools for module building and mods, but if I can't bring some friends into a campaign then we have a problemo.