Oh wow... Nexus is frightfully easy compared to the other relic upgrades we've had to endure. We don't have to go through dungeons, or fight tons of random monsters, rely on RNG or Gil complete it. Nexus is incredibly easy going compared to the past steps. I, for one, love the primal battles and find them very exciting, so trying to complete my Nexus in my own time is enjoyable. If you don't feel like grinding, then don't grind. Let it come naturally. If you aren't prepared to spam and spam, or put the hours in, then you don't deserve your Nexus yet.