As for your point:
> You can’t watch videos on it
I don’t seem to have the same issue? Most videos on the internet stream/load fine without much struggle on my X220. Does your laptop heat up / spin up the fan?
Here is one of my several stories on ancient-vs-modern Thinkpads:
https://www.theregister.com/2021/11/26/thinkpad_motherboard_...
I personally detest videos as a source of information and try to avoid watching them. I prefer watching video on a bigger screen several meters away, and I don't do much of that.
That being said, I have both i5 and i7 X220s, i5 and i7 T420s and an quad-core i7 W520. All play video just fine for me, and under Linux their performance is good and they don't run hot.
My i7 X220 is like new, and works like it too. It is maxed out with 16GB RAM and two SSDs and performs well. I do wish the screen were a bit higher-res, though.