And the e-unit may be tied to a single supplier, which the currency wouldn't be.

So you have these units which on the one hand are supposed to be redeemable in a specific way, but in another are a kinda sorta stand-in for 'real' currency. At the same time, the e-units may be influenced by physical failures, and also limited by contractual specifics.

There's a lot wrong with money, but I think people are getting confused by the purely transactional accounting function of money, and the political and social side-effects of money-ism.

They're close, but they're not synonymous. E-units will have different features, but unless some of these specific questions can be answered they won't necessarily be better.