I dont think "just import them" covers the difficulties a lone farmer would have in transport, customs, language barrier and maintenance of a fairly random piece of equipment across an ocean that is also critical for their primary source of income.

And imagine you have a warranty dispute or similar

Belarus are already imported into the US, as I recall.

Oh, i didnt realise that

An old Belarus 420A is a simple tractor. Even a modern 742 or 1220 isn't that complex. But it's simply not as capable as a Fastrac 4 or 8 series, or a Valtra N or C series, or a Deere 6, 7 or 8 series for example. They're just not in the same league in terms of what they can do with tool management, fitness for specific tasks or tool interop.

As a single example, there's nothing that Belarus make that I'd want to use for buckraking a heap of any real size. They don't have a JCB 435S equivalent, or a heavier Fendt or Claas.

They're great tools, but you're not going to get the hectares per hour of sowing or harvest or the movement of tonnage of the modern competitors.

But isn't this self-defeating reasoning? on one side you say things need to be simpler to repair, on the other you say simple technology doesn't cover your needs. A lot of these advanced features are so complex and so intertwined to each other that you really want only a qualified person to be able to "try to fix it"

The whole complexity narrative is false pretenses.

The new tractors contain computers and need tools. Manufacturers refuse to sell tools and placed equivalent of DRM on computers to stop you repairing your tractor on purpose. They make their supplirs sign contracts where the supplier is not allowed to sell parts to anyone else. None of these issues are due to complexity, all of them about you loose property rights over your possessions and turning physical goods into a subscribtion model

Should there not be the option to break whatever you own however you want to? People who know they can fix X should be allowed to fix X

You surely are allowed to break it if you want at the cost of loosing the waranty. If you mean you want to be able to break it and still have the waranty then no.