Because you generate, at best, an adversarial situation. The self-repair users are in it mostly for being cheap (or thinking it’s cheaper) and are (largely) unable to do a better-than-trained-technician job of a (probably) complicated job. Both are an annoyance to the producer. And not one where they risk a lot for (this only affects a minority of purchases)

On the other hand, mandating long warranty times puts the Producer vs the state. Which is a much harder situation to decide “I’ll just ignore that”.

And if you say; that right to repair is also a state decision… it’s only kinda. Because what right-to-repair means (or is thought to mean) differs _widely_. But the nice thing about the warranty thing would be that it would create a large incentive to make it cheaper to repair things. Which probably ends up with the same situation (ie experts, or self-perceived experts, being able to help themselves)