Not true even in the slightest. Maybe to run the bloated, buggy skins that the manufacturers throw on there. Stock Android has been running fine on 2GB of RAM for a couple years now, and when I had the iPhone 6 the Android devices were more multitasking friendly than the 6.Other phones need to put 3-4gb of ram because Android is a resource pig and requires it to even run as smooth as iOS with 1-2gb.
Don't knock it until you've tried it.