Earlier quoted context omitted.
I use vanilla Emacs for everything. For me customisation isn't what matters, it's having an editor that will never lag, requires barely any ram, and can be used over SSH on pretty much any machine.
requires barely any ram It's incredible to me that our tools have bloated to the point where we look at Emacs and think, "Ah yes, what a svelte program!"
On my "small" laptop, I only use Emacs... Trying to run IntelliJ or VSCode makes the laptop burning hot and forces the fan to keep running. With Emacs, no matter what I do, it's always quiet and cool.