The performance degradation is just my experience from a Galaxy Nexus, a Galaxy Tab 2, a Nexus 5 and most of the older Android phones friends & family have/had.

The performance degradation is just my experience from a Galaxy Nexus, a Galaxy Tab 2, a Nexus 5 and most of the older Android phones friends & family have/had. I don't remember from the earlier Android days. It's entirely possible this is "fixed" nowadays, because flash/UFS technology has progressed and/or device makers are finally using slightly less crappy components.