hello,
as always: imho (!)
i own a x200s ... bought it in march of 2009 =?> so its approaching 17 years ...
it was a really great device with one of the best keyboards for a small notebook. and i still use it multiple times a week for example to browse hackernews, reddit, ... or watch some video etc.
buuuut: its nearly 17 years old ... everything is starting to wear - i wouldn't invest a dime into it right now.
what do i mean by that: keyboard has faulting keys, case starts breaking at heavily stressed regions - for example around the cursor-keys -, display is (slightly) mechanically damaged, batteries are beyond usefull etc.etc. ...
just my 0.02€
My understanding with this project is they also replace the screen and battery with newer parts e.g. higher resolution, or at least that's an option, and all the ports are new (it's a new motherboard). So really the only 'old' parts are the keyboard and chassis. My understanding is there's lots of cheap replacements for the keyboard floating out there given the mass production and the original intention for this device to be easily serviceable by IT departments instead of "RMA everything."
What's a good alternative to 2010 Thinkpad X200 series, with potential for coreboot support?
Yes, also had one and it was decent for its time, but it’s not great, especially compared to anything you can get today.
I also have an x200s that I got new in 2009. I've replaced the keyboard, battery (multiple times), palm rest, upper shell, and probably a few other things I'm forgetting about. I haven't put new parts on it for a few years, but as recent as ~2020 they were very easy to get and affordable. My little x200s is a dedicated HaikuOS machine now and I hope it keeps running for another two decades!