[ottischwenk]

I have no problems because I read all the books with the licenses of the corresponding accounts.

Format changes are unnecessary work and require the presence of a computer while I can get and read my books from wherever - without breaking a single law.

And if a device should be stolen from me, the thief can read all the books, but nothing else can do with it.

I don't have to worry about the return of libraries either - DRM does that for me.

DRM gives me only advantages - not a single limitation.

And since all of my devices are configured in this way, it doesn't matter much if a device should fail (apart from the device costs), I have my files in my cloud.