well, yes and no
brass is annealed from the factory. so people doing "lots of very tiny-detail-oriented operations" would be doing so on generally unfired, freshly annealed cases. it is not necessary for the shooter to re-anneal their brass prior to initial case prep.
similarly, fire-forming happens on freshly annealed from the factory cases so the hand loader need not anneal the brass prior to fire forming.
after many firings, the case necks will get hard. you can tell a difference in feel. you may not be able to achieve same neck tension you previously got. instead of discarding the brass, you can anneal it and restore it to about the same hardness it had when it left the factory.
in my experience, ackley improved cartridges rarely need trimming and so last long, annealing is beneficial.
i would anneal my lapua 223rem brass that i use in NRA HP/CMP because i collect and reuse every case. however, for my regular blasting ammo used in classes and in the field, i wind up losing the cases within 3-4 firings so they don't ever get to the point where they would require annealing.