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Framework proved repairable laptops can work, but almost nobody is willing to buy one
(www.xda-developers.com)
This is a most excellent place for technology news and articles.
I would only really get a linux tablet, I'm with you on that, I plan to use a metal lapdesk with a charachorder and magnets which will mitigate the exact issues you're talking about while also letting me take a tablet on my flights so less bulk. Gotta get a bit creative if you're doing it that way but it is doable.
The heat from use damages integrated parts equally. Laptops and phones are disposable and shouldn't waste on modularity because when one part goes, typically the rest follow. Modularity adds bulk weight and can interfere with cooling. A lot of those modules can be replaced by cheaper, and more convenient specialty cables.