That doesn’t make sense. Storing your data twice, once not E2E encrypted is the same as only storing it once without E2E.If only you could use it on devices it supports, and not others - if you have an older device; in my case, a perfectly functional six-year old MacBook - I cannot enable ADP at all, because this one device is not „compatible“.
Forced obsolescence is still a thing, if you‘re Apple.