> Some business laptops from Lenovo, Dell, and HP rank among the most repairable laptops
I can confirm HP isn't too shabby. Very easy to take apart, and they even put out maintenance and service manuals, at least for their Pro/Elite Desk/Book lines. They show how to disassemble them, the possible part-numbers (for example the different available keyboards with or without backlight).
I've never had to actually source any parts so don't know how easy it is, especially once they get old.
But, in general, I would personally not recommend the laptops. They're cheap junk with ridiculously bad screens.
The desktops are quite OK, though.