Damn, son.
1. If you don't wish to use that option, and play it like a regular 4 to 6 member party D&D game, then go right ahead. Nobody is forcing you.
2. What about when there is a solo adventurer who is exceptional and manages to accomplish things on their own? Do they not accumulate large amounts of experience by themselves, which manifests itself in their advancement being accelerated, and then gaining higher stats more quickly?
3. People min/maxed and soloed BG1 and BG2 and the IWD games.
4. Drizzt, escaping from the Underdark, as well as multiple times later on in his career, when he was alone.
5. Artemis Entreri.
6. Elminster.
7. Alias and Dragonbait.
8. Plenty of other characters who adventured solo or with only a single companion, within the Forgotten Realms or other D&D-based settings that neither I nor you know about.
This isn't "not okay" just because you say so. It makes sense within the settings and the rules and with the justifications they have stated.
They have stated, multiple times, that there is always gonna be some artistic licence taken because it's literally impossible to make a video game representation of 5E D&D 100% accurate. 5E has nigh-on infinite possibilities and they'd never finish programming the game if they tried to emulate that completely. Then you'd complain that it's Larian's fault that BG3 was never released.
When all is said and done, though, they're in the business of selling video games and they want as many people as possible to play their games. Nobody is being forced to do so. If you really think it's that bad an idea, then accept that you paid the money and accepted the user agreement when you downloaded the game and this was always one of the risks of buying a game in early access.
Next time, maybe it'd be better to wait until its complete so you can make a fair assessment of the finished product.
