I agree that Kate is a good code editor. I have tried more than a year ago when I still use KDE Plasma (now switched to Gnome). Honestly, I am happy that there is at least one GUI Code Editor from a big community that actually on par with some popular code editor (VS Code, Sublime, etc). Because I see that most code editors made by the Linux community are always lacking in features when compared to other popular code editors. However, there are some things that make me not use Kate as my daily editor. One of them is the file browser feature which I find more complicated than its alternatives in Sublime Text or VSCode for example. In addition, the small number of plugins for Kate is also one of the reasons I do not use it.