@Lady Scale as in size of community served -- and so, moderation burden in terms of complex social dynamics to be responsible for, and also burden in terms of amount of input and amount of demand.
Although a small enough amount of works allows feasible tradeoffs from technically-implemented features to manual curation activities done as part of the moderation-process of ingesting new submissions.
Like if you look at the Darth Maul Estrogen Brigade, they have (well, had, I think. The site was still up last I checked but I don't think they've been active since the early 00s?) iirc chronological, subject-oriented, and a few other different views -- that would be database queries on e.g. AO3 -- that are simply manually maintained HTML pages.
(I'd also look at the PPC, here. I don't KNOW how they're organized, but I think they're still active. I love their forum, as a piece of technical work -- it's my idealized model of where software dev should fit in society.)