Also, when I was first getting into theme making, hard-to-read aesthetic themes were the Big Thing. To some extent they are still the Big Thing. Even though I couldn't read any of them, I still thought I should make themes like that, because that is what people liked. It was later on that I started making themes that I would want and be able to use. (It was inspired by me installing others' themes and consistently having to change the font, font size, padding of the boxes etc)
It's a pretty major thing that affects us when starting out, I think, even if we ourselves are unable to read them because of disabilities , to make those aesthetic themes. Even now many, many of the very popular theme artists I see have very unreadable themes (for example I love yukoki themes but am unable to use one, or read most blogs with them, because they have small text and difficult color combinations for my brain to process).
If you're disabled and starting out in theme making and churn out an unreadable theme or two I won't hold it against you, it's what all of us probably do unless we go into it with the idea "let's make themes for us." Just try to learn to make accessible themes and eventually you'll get there.