Yeah, true solo (the term that is generally used for playing games "one handed") is definitely a really big discussion point when it comes to soloboardgaming. A lot of people will only play a game if it has balanced or qualities that support it while others have no problem playing 2+ handed, depending on the game. I'm personally of the "I don't mind playing multihanded camp" but totally understand the preference. That is why we include those qualities in the poll because it helps to understand what portion of the community prefers which style (and helps those who prefer those styles find those games).
I think once you get deeper into the system though, there are more enabling cards and investigators that allow for true solo, at least on the easier difficulties. Luckily, there are deck building experts who share their decks over at Arkhamdb if you aren't heavy into the deck building stuff though.
I've been playing Voyages Campaign, and gearing up for some more Hexplore It for the month once I get a bit more time to play some heavier games. I've been trying to utilize the microblogging platform of kbin a bit, so if you are interested in watching these places, you can follow along here:
https://kbin.social/m/wakasm/microblog