I've been on a non stop thinkpad streak since 2005 or so. T42 (IBM), X200, X230 and now X1 carbon.
I used a thinkpad X200 back in 2014 or so and it got completely destroyed due to a spill. I replaced the memory, keyboard etc. but was unable to get it to work again. Also, the monitor had developed a few dead scanlines so I decided to buy another one. This was my primary work machine so I needed something quickly. I got another x230 off ebay. It was a piece used for demos at shows so it was refurbished. Threw Debian onto it and started work 2014. I used it straight till 2022 or so. It was my primary machine. I replaced the battery, added RAM. Then the fan got damaged and the front plastic plating got cracked so it was no longer presentable. I bought an X1 carbon but gave the laptop to my son. We bought a fan, thermal paste and some plastic parts for the casing, a new battery etc., watched a few youtube videos and fixed it up. It's still running and they play casual games on it. It's now atleast 10 years old and still going strong.
It's a very strong machine with great longevity. Though I feel that the newer ones are not as good as the old and the X1 is definitely less repairable than its older cousins.
I changed recently from X1 Yoga Gen 2 to X1 Yoga (2-in-1) Gen 9. The decline in quality is so clearly visible, the external pen is poorly designed and died after 6 months. The hinges are as loose as in a 600$ laptop. The whole thing makes cracking noises under slight stress. Also, Linux compatibility is poor, my Webcam still does not work. Battery lifetime is a joke too.
Lenovo made this Laptop worse than 7 years ago, and it's their top line model for > 2000$. It's such a shame and sad to see. There's no very good alternative with integrated touchscreen and stylus.