With cars there is a key difference: car service people usually are required to complete a multi-year long education with proper certifications (at least in Germany), and they get proper service manuals, genuine tools, spare parts and utilities from the manufacturers (as a result of the right to repair laws mentioned in the article), and third party replacement parts have to be certified as well (at least in Europe).
With phone repair shops, you have no guarantee that the person doing the repair is actually skilled, or that the repair parts are genuine/certified in any way. The right-to-repair laws have to be extended to force manufacturers to provide genuine spare parts, the sooner the better. Lithium battery fires are a real and scary threat.