I've played this game since beta without a care in the world for RNG.
I'm not going to be doing the Atma questline, nor am I going to be farming for mirrors.

I don't really care about the RNG involved in dungeon drops.

If your friend is the type to be a hardcore player that wants everything, he will not find what he's looking for.
If he's like me, and just plays games for fun, it can absolutely be done.

I'm happier than plenty of FFXIV players out there, simply because I don't care for the items that require atrocious RNG battles