Issues on Github consist not only of bug reports, for example, but also of feature requests. If, for example, you only display issues with the label “Enhancement” at github.com/Eugeny/tabby, there are already over 300 of them. In addition, I have made the experience that often reported issues arise from Layer 8 problems. And that some issues, unfortunately, are not closed when they are outdated. Generally speaking and not related to this terminal emulator.
By the way, according to github.com/vim/vim/issues, the editor vim has over 1,300 issues. Also in this case, not all of them are actual problems that need to be fixed.