This is such an aggressive way of saying something unhelpful. Visual/information/interaction. design -can- be an important part of an app team. I also think calibre is clunky and many of their interactions inelegant. That it’s also ugly is not irrelevant - reading is or can be an aesthetic experience too. I’m grateful it exists but like Anki I really wish someone with real design skills could help them polish the rough edges - that would make it a pleasure to use rather than just ok.

Some designers are definitely terrible (e.g. whoever made the mind numbing decision to use hamburger menus in Gnome), but plenty are good at their jobs. Go and watch some Tantacruul videos on YouTube.