But doormen became a thing, so the value was understood. We have now lost that knowledge.

I suppose it's like enshittification. It's presented as a progression to a new worse thing when it's more of a Dark Age of 'soft' knowledge.

Labour was cheaper back then. Even valuable jobs can stop making sense if the costs outweigh them. That's the difficulty with automation making other sectors more efficient, wages get driven up while your productivity stays the same.