Good points here from many angles.
My view is that tooling is not only deceptive, but unnecessary. Unlike collectors of modern coins, we mostly accept that many if not most of our coins will not only show signs of use but sometimes significant wear.
I'll go further - some of my favourite coins are really well worn. An orichalcum sestertius, for example, can grow old very gracefully. Why tool it? If there's enough detail to identify it, I'm happy.
The only motive for tooling in most cases is profit. Don't make these people richer!