You strike again with another great point @hedge-x! Commenting on other's post and taking the time to get into meaningful dialogue in the comments on your own posts are definitely some of the best ways to build community!
I only recently started using Discord... but up until then, all the relationships I build were just through comments. Looking back, I probably should have gotten on discord earlier...but what can you do. :)
It is true that some people will have no interest in creating content, but love to consume it. They can definitely find a home for themselves here on Steemit just by reading and commenting on other's posts.