Earlier quoted context omitted.
> If initial space width was configurable in their editor of choice, would those who prefer tabs have any other arguments? Yes, of course, because tab width is * dynamically* flexible, so initial space width isn't enough
Yes because if you want to deindent with tabs it is just delete one character whilst spaces requires you top delete x characters where x is the number of spaces you indent by.
But for "dirty-width" indents, eg, after some text that can vary in size (proportional fonts or some special chars even in fixed fonts) you can't align with spaces while a tab width can be auto-adjusted to match the other line