Frankly I can't decide what's worse, spamming throwaway ages that can in the worst case just be deleted, or massive villager farms that have hundreds of the damn things, are difficult to control and shut off, and when not done right are prone to flooding the server with villagers to the point of a crash and requiring map surgery or reset. It's like 1.8 XP all over again: either so hard to gather and chance-based that it's barely worth trying, or requires building a grinder spawning hundreds of entities at a time and packing them into tiny areas.
(I would know, I crashed a server several times with XP farms, and I knew what I was doing.)