I'd definitely risk destroying an engine if the alternative were throwing it away and replacing it while there was still a chance it was fixable. Who wouldn't?

My point is the company is not going to provide you instructions that would likely damage or destroy the product, not debate whether or not one should attempt those procedures.

If I was following the shop manual and I broke a head bolt off in my engine block I would take it to a machine shop, but I wouldn’t expect the auto maker to provide instructions to remove a broken head bolt.

Businesses often wouldn’t. They have additional costs that you don’t have when you’re repairing your own stuff. Labor, liability, capacity, brand image, etc.

Automakers have been known to replace entire engines for recalls involving only one part of the engine, when they have concerns about one of the above factors.