I just moved from VSCode to RubyMine for my Rails work because I was finding the Ruby plug-in ecosystem for VSCode to be too flaky. Performance in both have been fine for me, despite being built in JS and Java.
OK, I will give you one thing: I do love Jetbrains IDEs. That said, I don't use them for everything. They use a lot of RAM for me when loading large projects, and they feel a bit awkward outside of "traditional" project structures that work well with VS Code.
I know Jetbrains is making a text editor, too. It does look very nice, but I have yet to try it.
This all being said, Jetbrains IDEs do still feel less responsive than more native stuff like Kwrite or Notepad++. It can be forgiven of course, but I think it's a valid point to note down, especially given how often people bring up that article comparing latency of desktop computers over time.
It is there, but seems to be essentially abandonware. The ‘mate’ command line tool to launch the app fails more than half the time on Apple Silicon, the plugins and bundles that exist are years out of date for Ruby and Rails, and I don’t expect it’ll ever get support for LSP.
So, sure, TextMate still exists. It’s still my default scratchpad for modifying text, and I even use it for some light scripting from time to time, but I don’t actually use it to build and maintain complex software any longer.
All that said, I really do miss TextMate.