Well , one thing to consider is who more likely need to stay in urban area. I think it is required more for college educated compared to tradespeople.

To find white collar employment? At least before remote work became prevalent recently, I suppose so.

On the other hand, the infrastructure for a large urban area doesn't run itself! Trade work is definitely needed to keep the roads paved and cars functional, the warehouses and stores stocked, the buildings in repair, etc., I would hazard even more so than in less urbanized areas.

I think what I'm getting at is that it seems a little too facile to say uncritically that anyone can just go drive a forklift and expect to make a reasonably liveable income.