How often? Daily; I use my phone and iPad while I'm mobile, out having a smoke, or whatever. At home I use my iPad more than my laptop.
You don't keep your source code in a minified state, nor do you keep it gzipped; the storage/bandwidth/IO considerations are for SCM-tracked code where there are potentially many, many copies of the same file in different states.
If you could reduce a 34-line (1KB) diff by 20% (average of two indentation levels of four spaces each across those lines), why wouldn't you?
You don't keep your source code in a minified state, nor do you keep it gzipped; the storage/bandwidth/IO considerations are for SCM-tracked code where there are potentially many, many copies of the same file in different states.
If you could reduce a 34-line (1KB) diff by 20% (average of two indentation levels of four spaces each across those lines), why wouldn't you?