Because it's not only about being able to repair everything at home, but forcing the companies to avoid anti-repair practices and making you to either pay an (purposefully) exorbitant price to have it repaired by them or just having to buy a new device altogether.

That's why that dude is a shill, because he is talking as if companies act in good faith (for whatever reson) and the devices are simply "too complex" to repair. They are not, companies are puposefully making it as obscure and hard to repair as possible so that, again, you have to either pay a shit ton of money for them to repair it for you or just buy a new device altogether because changing shit like the glass of the back of the phone is half as expensive as a new device or a design "flaw" that should be covered by warranty gets turned into a simple "motherboard is faulty and warranty doesn't cover it".

the guy's neither, of course. It's a valid opinion, well-described.

I completely disagree with him, but his point has obviously been considered over the course of a long career actually repairing gear.