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So if Draw Over Other Apps is a bad thing, why are so many people wanting to enable the process?

I'm trying to keep my storage down because the apps I move to my SD card won't stay there, so whether it has any bearing on storage or not, I disabled it wherever I could. If I notice that an app doesn't look right shouldn't I just enable it for that app instead of having it on all my apps? And what about Background Data? I haven't googled that yet but sounds kind of the same.