As the sibling also mentions, you need to add in ongoing costs, or expected yearly ecpensiture on TVs, which makes even the worst modern TVs much more expensive that older crts.

You need to do this with all tech.

But factoring in hedonic adaptation is fine, if general societal trends are also factored in.

30 years ago there was strong social institutions on workplaces that people have to buy into now. More people did manual labor where they need to pay for fitness now.

These things also needs to be factored in.