I hate to be that guy but this sounds very much like "old man recounts tales of how things were 'back in my day' to youngsters". The Apple II was not anywhere near as complex as the computers and devices we're talking about now and it wasn't wrapped up in the patents and chip licenses that nearly every piece of technology today is wrapped up in. You can't even have a DSP (digital signal processor) that would be repairable or that you could include schematics for without vioating any number of patents held by third-parties or patent trolls (and I'm not, in any way, saying that patent trolls aren't the spawn of the devil).
Apple wanted to make FaceTime open sourced and they couldn't because of a patent troll. I don't even think we can get into the complexity of today's hardware systems without running into any number of reasons why that stuff can't be "open-sourced". It's great that super-techy people want to be able to repair their own devices (and there's no reason currently why you can't) so I feel like the current right to repair movement, and especially people like Louis Rossman, are doing a huge disservice to the ideas behind people's actual rights to repair devices they buy when they conflate them with "open-source" and completely ignore the fact that 99% of people don't care.
Unless they find a way to show people what the upsides and downsides of the current situation are objectively, they're never going to get the support they need. As it stands, they're being misleading at best and downright lying at worst to try and push a narrative that gets to the end goal and, as soon as the lies come out, it'll push the momentum backwards instead of carrying it forward. The number of people with expertise to actually fix most of these issues with these complex devices is incredibly small and dwindling and opening that up to anyone and everyone without some kind of plan in place is just going to spectacularly backfire.