Solasta isn't a story driven rpg, it's a tactical combat action game. It is good that Solasta nd BG 3 are different, it means u are able to play both and get different experience.
Pathfinder kingmaker was always a game about kingdom ( the name isn't just for fun heh ). I finished it and tbh it's kingdom sim isn't as bad as combat and character progression. At least kingdom sim was actually new and unique there, much more deep and complex than in dragon age or pillars. But the combat and character progress after a few hours became a boring pile of.. stuff, it was the only rpg in my life where i just hacked all my party skills to 99 and autocombat through last few hours of the game, because fights were extra boring and repetitive. If it's something like that in a new pathfinder, than it can't compete with bg3, hell it can't compete with anything tbh.