In vim you can make some changes to a file, close vim, and then reopen the files, and then undo your changes, i.e. your undo history persists across sessions.

I use helix part-time but am forced to go back to neovim a majority of the time for a few reasons:

1. no persistent undo
2. no ctags and cscope (some C/C++ projects don’t work well with clangd)
3. niche plugins (e.g. I just found a neovim plugin that gives me a way to run ipynb files in-editor)

If 1 and 2 got fixed, I’d be a full time helix user

Biggest con of KDE + Krohnkite (to me) is no text-based config. I really have no desire to pour through the GUI to set up all my keybinds. I’ve tried this setup before, and honestly I mostly like it. However anytime I want to change something I just hate having to click through a menu with my mouse. The search bar helps, but often you’ll spend a lot of time guessing what the devs decided to name a setting. I went back to Sway and have no regrets. Though I’ll admit I wish there was something that was basically Sway with the benefits you mentioned here.

kitty. The ssh kitten is enough reason to use it. I work ob a lot of different systems that require OTP. Using the ssh kitten I can type the OTP once and can spawn new terminals that ssh and cd to the remote direvtory without logging in again. Obviosly the tabs and window panes are are a must too. There’s tons of other useful features that I like, like using hints to select nunbers, filenames, urls, etc in the terminal output.