> But if people are so busy, when are they planning to use their suite of bespoke software anyway?

The original blog post, and the ensuing discussion, is about creating software that fits your specific requirements, for the purposes of daily use.

As for using vim, the author did, for 20 years. The article discusses that in detail.

That’s one question never answered. It’s way easier to write a vim/sublime/emacs plugin than a whole new brand editor. These days, I try to use single purpose programs that does one thing and compose them instead of trying to get the “one true” software.