RNG is an artificial way to extend the lifespan of content. Though I'm not a huge fan of excessive RNG, I understand why it's there - so people can't wrap up content in less than a week and then unsubscribe. The only RNG I truely despised was the weekly lockout in coil, having just 1 shot at a gear drop for 7 days was really sad. Pretty much every MMO has RNG elements, heck, even offline RPGs do. And it was much, much worse 10 years ago, like the RNG hell Ragnarok Online unleashed with drop rates of 0.01% for Boss cards and an extremely high chance (99.x%) of breaking your gear when upgrading to +10. FFXIV is fine.