I think there are a lot of comics out there with art that is not necessarily 'good' if you judge them by some high or classic standarts. Some are simplistic by nature, and some... If I had a penny for every time I looked at some critically acclaimed anime-adapted manga only to realize that its first chapters someimes absolutely sucked in terms of said perspective or proportions or whatever, I'd certainly have a few pennies by now. But there clearly was enough charm in them - be it face expressions, details, or, you know, the story, for them to become popular even before the author improved, right?
Yes, comic is definitely a visual medium, so art matters, but it doesn't matter in the same way it does in an illustration. If it shows your intendend emotions well, if the actions that are happening are clear enough to understand, if the story is told as intended through that art, if the style matches the mood (or clashes with it, but, like, intentionally) - who cares if there are purposefully no frames with complicated perspective?
Plus, I very much relate on the "I know what's wrong with it, I don't want critique" point. But I am very touchy about unwanted critique in general.
Now, do I personally try to push myself with my comic in terms of drawing complicated stuff I never did before - sure. But that's 'cause I want to. Chasing inspirations and such. I'm having fun with it. If you are content with telling your story as is, without trying to jump over your head just for the sake of jumping over your head, then why should you?
I think it should be more about wanting to grow (if at all, I mean) naturally, rather than trying to force growth on yourself or someone just 'cause people said so.