The only problem is, this only works if there's enough competition for consumers to have a real choice. If Apple and the 4 (?) largest Android manufacturers all decide they're content with a repairability score of 2, there isn't a whole lot consumers could do, regardless of whether they'd like more repairable devices.
Another (unlikely, but possible) market exploit is that a large enough supplier could intentionally encourage the existence of lower-quality manufacturers, allowing them to gain trust from consumers who wish to buy (what they believe should be) quality, durable products.
