Flyin' Dutch - Would have agreed with you three weeks ago... However, I have a student at present who was having trouble with the landing roll - fine at touchdown but would over-control as we slowed down. I was persevering with full-stop/ backtrack circuits but not making much headway. A couple of weeks ago, thought I would change tack and try a few fast taxy runs to get some intense practice. In short, it's made all the difference and I'm fairly sure we've cured the issue.
As always, it's horses for courses - I have a wide grass area to play with, so an incipient groundloop can be managed with little problem and in this case, the benefit outweighed the risk...