this really isn't true at all. android works great on 2Gb of ram, you don't really hit issues until you load gapps. If you don't it works great. I actually run BlissOS on my old Asus t100ta and Im not the only one.
When you do nothing something like xfce works great, but when you actually start doing things like browsing the web, watching youtube etc then it starts to really become a slog. Meanwhile something like BlissOS is actually usable even when watching 1440p content (gpu not strong enough to test UHD)