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The point isn't that every user will know how to repair their own products, rather that they could if they choose.

Think about your lawnmower. If the engine won't run, maybe you can figure out through a bit of research that it's probably the spark plug. So you can go buy a spark plug and swap it yourself. You don't need the manufacturer to authorize your new spark plug.

However, many people would not know anything about where to begin replacing their spark plug, and don't want the hastle to learn, so they bring it to the manufacturer and pay a premium to have it done for them. But if they someday decided to learn, they could learn themselves. Or even take their lawnmower to a friend who can help them.

To take away those option entirely, only leaving the one option -- paying the manufacturer a premium to do it for you -- is what I have an issue with.

Bonus: the lawnmower manufacturer could include a type of safety lock that does not allow you to work on your lawnmower, to prevent a user from hurting themselves. However, the manufacturer should also give the user the ability to remove that lock, positively asserting that they know what they're doing (like giving the private keys, or allowing a motherboard switch to be toggled which unlocks the system, etc)