Linux Mint 21.3 on T14s is fantastic. Only minor bluetooth issues which come and go with kernel updates. Love the three-finger swipe to switch workspaces.
You may already be aware of this, but the T14s is "just another" Intel box, whereas the X13s is Snapdragon/arm64. I despise the random nomenclature of their product lines for that very reason. But IMHO a blog post about Ubuntu on more Intel stuff would not make the front page versus "here's the current state of arm64 on the desktop" is something I have keen interest in. I still have high hopes someone is going to have better luck with Microsoft's Dev Kit since it comes with a lot more ram (recently https://news.ycombinator.com/item?id=35757277 et al https://hn.algolia.com/?query=windows%20dev%20kit )