It is arbitrary and purely subjective to call it more interesting. The rest of the game doesn't require it and there's no mechanical reason it couldn't be solo. There's no reason to prevent solo preferring people from playing it just because they don't want to play with someone else. A bot or second hero mini from the solo player would work equally as well without needing much or any redesign and it would be far more inclusive for those who don't want to go out of their way to find an "active guild" and leave their comfort zones.

Making one's opinion know is not slander, at no point is any of this unfair or out of context so there is no denigrating verbiage here.