I'd love to see a company which doesn't copyright repair manuals, doesn't make devices difficult to home-repair on purpose, doesn't do this "planned obsolescence" things or any other assholy tricks to get a short term profit; and then market the shit out of this attitude - explicitly show people the things it doesn't do. I'd be their life-time customer without second thought.
I'm not sure about Lenovo as a whole company, but the Thinkpad line has the characteristics you're asking for. The only characteristic I've encountered that really goes against this is a hardware whitelist for things like wireless cards.
The Wireless card Whitelisting is due to FCC regulation, which states that certain classes of devices must be Certified by the FCC themselves in the "End-Use Configuration" to be legal to sell, use, take on Airplanes etc...
IBM (Now Lenovo) Whitelist Wireless cards to ensure that the device will always conform to the FCC approval that the device was evaluated for.
To be fair, if you buy a Lenovo/IBM Laptop (I've had four in the past twelve years) and ensure that the Wireless card you get it with is the top-spec model at the time, you should never have an issue. My current Laptop, an X200, has an Intel 5300 which is still one of the best wireless adapters I've ever used :)
There might be regulatory concerns for wireless cards, but it seems to affect LCD panels and a few other things. It's probably intended to make sure institutional IT departments don't mix parts between models so as to create a configuration Lenovo hasn't tested that might potentially have problems.
Of course, I consider it a problem when I put in hardware I want to use and the computer thinks it knows better. I have a hacked BIOS on my T61/T60p hybrid for exactly that reason.