A company takes for granted that they are good actors, and that their customers' interests are perfectly aligned with their own. With those assertions, increasing their control can only mean a better ability to make things good/safe/simple for their customers.
But that is an authoritarian delusion. Because real difficulty arises out of cross-party emergent complexity - illegible and unmanageable by any single entity. And the road to hell is paved with good intentions. This is blatantly obvious when you, as an individual actor, eventually end up at odds with whatever authoritarian scheme they've implemented - wishing to do something simple that you've personally judged as good/safe, but it's impossible to convince that centralized controller to understand / approve it.
In the real (multi-actor) world, we acknowledge that interests diverge on either side of a transaction. Someone who has bought a printer is then an individual participant in the ink market. Someone who buys a pocket computer wants that computer to act for their own interest - not for it to be beholden to the whims of the company who made it.
Unfortunately, always-on communication, the difficulty of reverse engineering, and overbearing copyright law have allowed these companies to double down on overarching control rather than allowing reasonable demarcation points. Apple could straightforwardly create an app sandbox that would allow running fully untrusted code with fine-grained capabilities, unilaterally design it to not have the vulnerabilities that the Web continues to have (eg fingerprinting), and allow sideloading after appropriate warnings. And lest you think I'm being partisan here, the same exact thing applies to Google's general insistence that sideloaded apps are less safe.
But it's much simpler and more lucrative to double down on authoritarian control until they're forced to create those demarc points, either by direct legislation or by consumer demand - eg if this recent censorship trend eventually pushes them to prohibit secure communication apps in their central stores.
Bad intentions are not necessary to build an authoritarian system. All it takes is enough good-intentioned people being unaware of the system they are building and their role in it.
As it relates to printers/cartridges unlike my car manufacture/gas hypothetical or the app store, I could potentially see certain IP (from patents to trade dress) rights that may actually help the printer companies argument (but again I think they backed down anyway).
I've been using a little multifunction brother laser printer and convinced my sister to do the same in college and those are the only printers I've used in a long while that don't give me issues.
The only other printers I used that never gave me issues were the high end laser printers at University.
You give complete access to a licensed dealer, that can be trialed, if abused.
Or you go to Brasil to pay 1/10th of the price and give them a copy of your password and address.
Something like that
As others have said there may be more apt analogies...sticking with the car theme, it may be closer to a market where you buy a Ford and then you can only fill your Ford up with Ford gas from a Ford gas station.
That market doesn't exist for clear cut reasons, but if it did you can bet Ford and other car manufacturers would claim the same thing, that limiting Ford owners to using Ford gas is for their safety, if Ford owners started putting gas into their Ford from a 3rd party, there could be all kinds of harmful additives or other quality issues with the gas that will damage the Ford. Of course Ford won't mention on their tax to "Ford gas suppliers" (of 33%) for access to the Ford car market.