I remember that phone[0] that google killed and that was back in 2013? Since then other projects have sprung up to tackle this. There are links at the bottom of the page.
To your point, I suspect the same, I'm trying to think of adverse consequences. The closest I can think of is something akin to the battery example, but in a different way. Maybe you're more comfortable putting high performing dangerous-to-handle components in a phone if you can seal it shut. Maybe component-by-component tech support accountability to a tech repair community is a new set of burdens they don't want to have. I suppose the latter feels plausible, but the possible impact on components seems less convincing.