[zaarn]

A modern tractor isn't simply a bunch of machined metal, they have several computers on board, including integrated laptops with vendor branding, to control various equipment or the engine or many other things. Several of these parts are not repairable and need to be swapped entirely (if you want a taste of this; modern car lighting assemblies with LEDs can't have individual sections replaced, the entire assembly needs to be swapped).

[toasterlovin]

What you’re saying is true. What I’m saying is also true. I worked in construction for a while. The equipment is similar. Most of the repairs are fixing worn out or broken pieces of machined metal or broken or leaky hydraulic lines, not electronics.

Phones are different. Usually repairs on a phone involve replacing a piece of highly integrated electronics, not a work out or broken piece of metal or plastic.