This is true. I agree with this part but would note that the supply chain for replacement screens would be constrained by original production volume and would force most owners to find used screens of questionable quality to avoid paying dealership rates for new screens. Like most vehicle models in a manufacturer's product line, these screens would likely only fit in a single model. I think it unlikely that manufacturers will standardize these units across their product lines so that an owner could simply find a used screen or a new screen from a different model produced by that same manufacturer.
There are probably supply issues here that end up rendering a perfectly good, well-maintained vehicle undriveable when specific components fail.
Then, as you mention, the lock-down of the devices creates another problem when the owner isn't able to access or modify parameters stored in a used screen to update those parameters to fit the vehicle that they own.
It's all a complex set of issues.
I am old. I have been doing all or part of my vehicle maintenance since I bought my first truck in 1976. A lot has changed. Most of those changes are improvements. It is so much easier to identify failed or failing components or sensors today than it ever has been. Vehicles today, like those produced 100 years ago, are durable products with tremendous opportunities to upgrade functionality, capabilities. If we allow manufacturers to turn vehicles into products that fail, with no manufacturer accountability, after only 10 years, requiring replacement of most parts critical to safely operating the vehicle then we have only created another waste stream.
Buying a car with analog needles isn't going to make that part more available if it becomes one of the last models with analog needles. Screens can be pretty standardized.