Nicely put.
Steemit will not only succeed, but will BLOOM, if there are a variety of interests that readers can explore here.
The people that are complaining about quality are in fact complaining about interests they dislike. Instead of complaining, they should as you stated, igore it.
The only valid complaint as far as areas of interest, is the possibility of kids seeing porn. FWIW, I like the NSFW content post here most of the time. Dealing with that issue is going to come down to how the NSFW tag is used
Maybe the devs could users the option to strike any post tagged nsfw.
This might be a good approach to the others complaining about the quality of subjects that do not interest them. Let such users preempt out of anything tagged as "sports" for instance