Agreed. I can't really think of any use case where a user would need to include a complex drawing with multiple text fields, shapes, colors, etc. just to report a problem.
The simple case of sending feedback of just a comment should be simple. Click Wishbox, gives you simple form asking for name, email, and message. Beyond that, I think this is really cool that you could easily add a screenshot with arrows and text explaining the issue.
Overall, I think the UX could be improved, but it has a lot of potential.
