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I can't think of a single senior-engineer position that someone can't train for in 5 years. Maybe doctors, directors, and top research scientists.

Okay, so that's like 5/40 of your workforce that's in training at any particular moment, right? That's not a trivial cost.

You've never seen a job posting asking for more than 5 years of experience?

I think very few people grow significantly in their field after the first 5 years.