bro you summed up really nice 
i had to discover all that up by myself aswell…
we are just wasting time on unreal for mobile purposes, i love the engine but its just not made for mobile dev.
anysways you are correct about everything there.
here is my catch ;
*I am using a free plugin called epicleaderboards which has engine availble with 5.0 or 5.3 but not 5.2
*so if i want a leaderboard which is pretty important for my game i cant build in 5.2 but i cant build it on 5.0 cus google doesnt allow it (cus of billing issiue) and if i build it on 5.3 the ads wont sshow up
its like a very bad joke on me
anyways thank you so much for your help if you know how to re wire the plugin for 5.2 please let me know or if you know other free method of online leaderboards.
also you can add me on discord: denizforst
its been nice to share the same suffering with some one else
cheers