Plus they’re cheaper, relative to repair professionals’ labor.

If a new refrigerator costs the same as 100 hours of skilled labor, then a 10 hour repair job (plus parts that cost the same as 1/10 of a refrigerator) will be economically feasible.

But if a new fridge costs the same as 20 hours of skilled labor, and the more complex parts come in more expensive assemblies, then there’s gonna be more jobs don’t pass a cost benefit threshold. As a category, refrigerator repair becomes unfeasible, and then nobody gets skilled in that field.