That base I posted on the last page was from A16. It had a single shotgun turret on each lane and spikes in the lanes, and could take on horde nights with full rad zombies without needing more than minimal repair (some of the poles on the inside end sometimes took some damage, and obviously the spikes.) So no, it didn't require all that farming of materials and days to repair.
It did, admittedly, take about 3 in game weeks to dig out and build (with an augur), but that shouldn't be unheard of for having an essentially unassailable base.
I know you can carefully craft a base that actually coerces zombies to follow a path because there is nothing else. Excellent achievement. But it is just the exception in the mass of possible designs. I never built such a base in A16, I don't know anyone who built such a base in A16. If we still had A16 AI, would you now be suggesting that all players always carefully copy that design so that they don't have much to repair?