Yep. The point is that most people don’t set unlimited stacks because those are annoying and usually get butchered. Villager one just makes it so it doesn’t make their AI work as often and makes them a little bit smarter
Plugins are really useful for reducing lag on server from mobs
SAML:
https://www.spigotmc.org/resources/simple-anti-mob-lag-1-9-1-15.67484/
VillagerOptimiser
https://www.spigotmc.org/resources/villager-optimiser-1-14-2-1-15-2.68517/