That said, its display tech is bordering on too old. 1366x768 is too small for most people to reasonably work on. In true X220 style you can upgrade this, and although you give up a DisplayPort on the dock, most people won't care about that. The other problem is external resolutions are limited to 2560x1600, which isn't 4k. Finally, a lot of software has gotten too heavy for its CPU. You can run things like VSCode, Slack, Google Meet, etc. on it, but it's not wonderful. I have a basic belief that if an app is slow on the X220 it's too slow in general, but developers of workplace collaboration apps and almost all websites disagree.
One of my "when I get rich" projects is to design/print a board to put a Raspberry Pi 5 CM in an X220 shell and sell it along with display upgrade kits. I think I've had actual dreams about this.