Well that is kind of the idea 
After a week of use, your workflow will adapt, and you’ll find it more enjoyable rather than frustrating. We are one of the few note-taking apps that primarily focus on short-form notes. Our goal is to encourage you to create brief and concise notes.
If you use Supernotes like you would with other long-form note-taking apps, you won’t experience the benefits, and it will feel like a worse experience rather than a better one. The reason Supernotes is fast and lightweight is due to these constraints, as they assist you in thinking more clearly. Many Supernotes members have switched to our platform for precisely this reason. They find that having to consider what they write prevents them from getting lost in an abundance of long-form files.
Having said all of this, we do want to support long files and pdfs, but this will be on a view-only basis and sounds like it would match your use case well also.