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You keep mentioning carpal tunnel but I don’t think that was his main point.

It’s true that white and blue collar work have ergonomic and health hazard mitigations. I saw from another comment of yours that you mostly had to work on unsafe and inconsiderate commercial crews with no decision-making ability, which understandably colors your view of physical labor. You’re also right to point out a novice would likely fare similarly, especially if approaching a career change romantically.