The difficulty in tracking and the ease with which large transactions can be done in it would be a big differentiator from cash and one of the things government wouldn't like about it.

While it doesn't bother me personally, it would be an issue of any digital truly anonymous currency as far as governments are concerned.

That said, I was referring to more mundane things, like how most people aren't used to the responsibility that comes with that kind of currency (eg if you accidentally send to the wrong address, the money is essentially irreversibly lost).

Cash, being a physical item is less prone to some of these issues and because it isn't entirely fungible (with bills having serial numbers), there are various things that can be done with cash that can't with a truly anonymous digital currency, like tracking stolen currency and/or reissuing it.