I think Van is maybe missing, solo is vs other solo's, teams in teams, so no, playing solo isn't pointlessly extra hard other than you are relying on yourself and dont get a resurection state if you fuck up.
But... I still like it, lots more chances to play tactical/smart. (Like not shooting even if kill might be easy due to revealing self to others/letting them kill each other.) In teams it's always a bit more hectic and more of a brawl since unless you get them in the open, downing someone usually gets picked up in cover and never know who's discovering who and usually can't listen as well if teamates chatty in voice. "I don't see anything". Thank you for that useful information...