But that's precisely what solo players usually strive for: the additional challenge. Being able to say "I did it, despise the odds being stacked against me".
You have no idea what you are talking about. Hardcore players do that. Actual solo players, people who like having 1 character they control and manage in RPGS don't play BG1,2 and similiar titles exactly because it is too challenging for an enjoyable experience. They play Skyrim, Witcher and many other RPGs and there are a lot of players like that. And guess what, these people bought and enjoyed Original Sin 2 because Lone Wolf allowed them to play the game the way they want without feeling handicapped.