Open plans and schematics, interoperable, standardized. I should be able to unplug a component from my computer and plug it into another one. I should be able to replace broken parts. I should be able to, if feasible, make it myself with off the shelf components.
Thank you. So, last year, the Lower Merion School District, in a middle-class, affluent suburb of Philadelphia found itself in a great deal of trouble, because it was caught distributing PCs to its students, equipped with rootkits that allowed for remote covert surveillance through the computer's camera and network connection.
I admit I have only skimmed this yet, but that was 12 years ago. Back then, copyright was a major problem for a free and open society in which people could freely communicate.
The world has changed since then. Those opposed to such a society are now more likely to talk about disinformation, radicalization, child porn, hate speech rather than copyright. Those pretexts aren't really any better of course.
I think the most compelling reason will be performance.
In enterprise is already soldering ram directly onto the chip, it's only a matter of time until the same goes for consumer tech. Fusing the chip to the board has benefits too. When most people don't ever upgrade or repair their computer a 10% speed increase that makes upgrading impossible just makes good business sense.