I think any "Sublime Text of X" should also support offline only use. In my book this rules out apps that only function in the browser, require syncing with some service to function, or are only offered as a subscription service.
I am sure there are some pro tools for email using emacs/vim setup.
Actual luxury doesn’t constantly try to upsell you or get in your way in the name of boosting “engagement” or some similarly-disgusting metric.
I want one of those big master lists made for things you can actually own and not rent - from free or non-subscription software to devices that won't randomly brick themselves if a company's server goes down.
I like your idealistic view of what luxury should be. But its not like that unfortunately.
If they did email, I'm 100% buying it the day of its release. Even before, if possible.