That's the thing. Solasta has maxed out for the budget it has, resources it has, and coming from a very small studio. Certain adaptations to 5e mechanics were done properly in that game and everyone can see that, which is why Solasta is referenced so much on the forum.
The other criticisms with Solasta are largely due to the fact that they're a smaller studio than Larian with less money than Larian. In essence, Solasta can't ever be more like BG but BG3 can be more like Solasta.
Larian has the resources to improve their game.
That's pretty much the essence of it. It's a roundabout sign of respect, actually - people know Larian has the resources to do something about it, whereas most people wouldn't even bother for other cRPGs with massively limited budgets in comparison. Because let's face it, the only other cRPG with a moderately sized budget right now is Pathfinder: Wrath of the Righteous, and BG3's budget is still absolutely astronomical in comparison to that. (But still, if you let people think about this even harder, you start going into toxic Pokemon-style territory, where half the fanbase starts thinking about what other studios would be able to do if they were given any chance at all with the same budget.)
One needs to understand that people don't want to be talking about BG3 in the end as a game that's great
despite the combat, largely carried by a massive budget that has seemingly gone into its writing, visuals and voice acting. That's considering no other cRPG that came before, besides their previous game DOS2, will ever be able to compare in that department - and we probably won't even see anything similar after, besides a possible sequel or a DOS3 (unless Wrath of the Righteous really takes off like I think it will). There's a reason the vast majority of criticism has been solely focused on the combat.
The only other cRPG in recent memory from another company that actually tried to match DOS2 was Pillars of Eternity 2, and that franchise straight up
died (and is getting resurrected as a first person RPG) because of hideously bad mismanagement. Mostly their mismanagement taking the absolute wrong lessons from DOS2's success, that pretty visuals and full voice acting cannot mask POE2's flaws in nearly every other department.
This current half DOS/half DnD design has largely worked to the detriment of both systems, and has split the community apart. These forums are largely occupied by people who want the game's combat mechanics to be a lot closer to DnD, while the Reddit page is dominated by people who are fans of Larian's games first and are largely new to DnD or have zero interest in DnD as a whole otherwise. Maybe Larian wants to maintain as big of an audience from both communities as possible, but it's only going to get worse the longer the EA period is and people start thinking about the actual design with each subsequent replay, unless they break this and take a stance somewhere. Even going full DOS, as much as it would not be my favored solution at all, would be better than the current status quo - because DOS2 at least had a lot of possible depth to it, and you had to put much more thought into it besides 'get to high ground as soon as possible or stealth ambush every encounter', even though what I described were still important aspects of DOS2 combat.
