definitely useful, for me personally, the use case is using it to write on lambda as the obsolescence of the old editor while the new one is still useless for me as the vim emulation is not usable. thanks, mate.
I've had the same experience with things like vim emulation in vscode but I switched to LazyVim from vim a few months ago and it's been a smooth experience for me.
I tend to hit that instead of Esc everywhere I'm using a vi-like after having a weird keyboard issue that nerfed my Esc key for a while (long and uninteresting story) and then finding that Ctrl-[ was more comfortable for me anyway.
(of course that may not work at all in the lambda editor, I'm mostly using it in terminals with heirloom-ex-vi, but seems easy enough to TIAS some time)