I've published a meme I created, and I've done one or two smaller posts. We're they low tier? I don't know. Like everything else here, it depends on everyone's definition and even that's going to be subjective.
I do agree, though, it is okay to change things up a little and even experiment with other types of posts. While Steemit is a long form blogging site, it doesn't necessarily mean it is that exclusively. And again, just because it's an image or a few lines doesn't automatically make it unworthy of a vote. It's just likely to get as many as something else, and too many, as you point, will cause people to stop.
With autovotes, though, it's harder for me to justify letting down too much, if at all, because I know those folks would be trusting me to do what's become known as my best each outing. However, for anyone else who actually might look at the post, they're free to upvote, not, or even flag.
It all depends on what you have your audience used to, you are right, it is subjective.
Autovotes somehow become chains, because you know you´ll get votes, you feel you must deliver awesome content, so its a double edge knife, and i like it.