Sorry, but what? Being able to repair a device means that you can (and usually will) be able to prevent demand spiking for a brand new device that uses as many or more materials than the last.
For starters, imagine a world where vehicles were not repairable. I'd argue that any mass-produced thing benefits from repairability.
If you have infinite money, yes. Most people in the world do not have it. (And if you do not care about the environment, too.)
Repair shops exist for this purpose. I’m not saying every individual will repair their device themself if it breaks. That would be as out of touch as saying most people will just buy a brand new phone anytime theirs has an issue.
Making things less repairable means that whether you’re willing to pay someone else or not to fix something, you will be unable to.