Because I formed these habits in the nineties and 00’s, well before git was a thing; and because nothing I write matters, other than possibly to my employers, in which case I do use (primarily) git … Or other version control. (Believe it or not, I’ve used subversion.)

Most of the documents to which I apply this are things like my resume and DNS server. No one but me will ever care.

Also, I like you both for asking this question and for how you put it.