I genuinely don't see how multiplayer being an option makes single player less good.
BG3 is literally the best game I played in 12 years and I thoroughly enjoy it both in single player and multiplayer.
I am glad you like it.
As someone who plays RPG in singleplayer only, I find quite a few perplexing designs in BG3 that can only be explained as "but multiplayer". I also find some usual RPG features that I value very much - quality of custom protagonist dialogue choces and writing, companions, immersion - to be below a standard I grew accustomed to. Some of them might not be result of multiplayer but just quality of the content, but for example I am convinced that companions are affected by being NPCs, playable characters and coop buddy avatars. Similarly custom character's content will likely serve as a basis for origin content as well, which would explain why it's so bland and non-discript.
BG3 is impressive in terms of much it does, but I personally value games that do fewer things very well, over a game with multiple underdeveloped ideas. The problem that by reaching for such a wide audience, I don't care for a lot of what BG3 offers, while what interests me is of mixed quality.
