The problem is that you must adopt a standard tab width for this to approach. Otherwise when you mix this with team members who use only spaces, things with be

The problem is that you must adopt a standard tab width for this to approach. Otherwise when you mix this with team members who use only spaces, things with become inconsistent. Also, as I pointed out, with languages like Python & Haskell, it is required to fix the tab width. At this point, where you must dictate a fixed tab width that everyone must use, I fail to see any advantage to using tabs (other than a miniscule reduction in file size).