See eg:
"THINK: A brief history of ThinkPads, from IBM to Lenovo"
https://www.notebookcheck.net/THINK-A-brief-history-of-Think...
Also, they used to be made by IBM "back in the day", until the chinese bought the brand and designs.
I think a big part of the appeal is that the business workstations were popular for businesses, and those businesses would operate on a 2-, 3-, or 5-year upgrade cycle and unload used high-quality workstations on eBay for dirt cheap, which also made them popular with the hacker crowd.
[1] example for t14 - https://psref.lenovo.com/syspool/Sys/PDF/ThinkPad/ThinkPad_T...
Plus they are the best thing ever you can buy used. Cheap, robust and better than anything you could buy for the same money.
Random ebay check: T480s 14" Laptop i5-8250U 8GB RAM 256GB - 70€
I mean, yes, the loyalty to Thinkpads was in part because they had great keyboards. The first I had new, an i12200 series model 1163, was a badge-engineered thing made by Acer, with nasty plastic screen hinges that failed, only USB 1, only 1 SO-DIMM slot, etc... but it still had the IBM keyboard.
But the thing is that since the ?30 series (X230, T430, W530) Lenovo has gone over to awful chiclet keyboards.
So the model you cite is a late one with a nasty flat almost-no-travel keyboard.
Which is why I only use ?20 series or older, which have the good, 7-row keyboards.
Liking the flat abominations more?!
Surprise is no longer adequate and I am forced to resort to astonishment.
They are great business laptops. Still amazing chassis quality and keyboard. Great driver support from Lenovo. I also get over 8h battery solid out of mine still, on low power plan in Win10.
But the business laptops of HP and Dell are also good, the HP Elitebooks and Dell Precisions/Latitudes.
It's just that when people buy Windows laptops, they buy cheap ass 300$ Acers from Walmart or a really expensive and loud gaming laptop. These business laptops are built to last for company use, and it does show. If a company buys 1000 laptops from HP, Dell, or Lenovo, and they are shit they won't buy from them again, so the quality has to be high. Yes, new they are expensive, but a lot of enterprise companies do 3 or 5 year hardware refreshes so used you can get them cheap. And company employees in general take care of their laptops or just use them docked 90% of the time. My keyboard looks new after 3 years because I most often have mine docked or hooked to an external screen/mouse/kb.
ThinkPads had a reputation for being durable, but also somewhat repairable, so something of a DIY laptop community developed around hacking on ThinkPads more than any other laptop brand. This is clearly the market that Framework wants to appeal to.