Boycott the company, buy from another manufacturer, lobby the Iowa government to stop these abusive practices. Or just sit back, bend over, pull down your pants, and take it while wearing the branded cap of the company which is abusing you?
Parts availability is a massive factor. When you break down mid-task, your task is often time sensitive. You can't always risk having your tractor stuck in the middle of a paddock for weeks while you get new parts in.
So, the reality of choice is pretty much down to what your local tractor seller/repairer supports, because they'll have the supply chain setup to cope with certain brands only.
The issue is that the tractor senses if you try to repair it yourself. There’s a trap mechanism which will punish you if you’re audacious enough to try to fix your machine.
Really it’s all about choice now isn’t it?