Whenever you manage to make a specification "simpler" when there are in fact a lot of implementation details you're giving away the chance to modify the behavior of the stuff that is implied.
E.g. think why Google just doesn't buy Oracle servers instead of developing all their software infrastructure -- they wouldn't be able to provide the service they do and they wouldn't earn anything. Whenever you decide that you "don't care" you didn't really remove complexity, you just decided to accept the way the system behaves by default with all the limitations that come from that.
Idealists think that a lot of the details can be "abstracted away" just because they'd rather not think about them, but they are still there and they make the difference.
E.g. think why Google just doesn't buy Oracle servers instead of developing all their software infrastructure -- they wouldn't be able to provide the service they do and they wouldn't earn anything. Whenever you decide that you "don't care" you didn't really remove complexity, you just decided to accept the way the system behaves by default with all the limitations that come from that.
Idealists think that a lot of the details can be "abstracted away" just because they'd rather not think about them, but they are still there and they make the difference.