Fine, whatever. I don't have a Nook; I don't have wi-fi. I have to sideload books. When I changed my credit card at BN, I had to redownload everything I'd previously purchased using a different card. In fact, that experience was was set me on the trail of Apprentice Alf, because it was annoying and time-wasting.
No other epub DRM interfered with my ability to read my own e-books on my own device, only BN's.