I managed to get Ryzen 5850U/15W Thinkpad with 4k display in 2021.
There were some necessary firmware updates during the first year to get the suspend and power management working (afaik, not so many kernel bugs), luckily fwupd now works for Dell and Lenovo so fw updates are easy and there is a popup to recommend them when available.
For the past year it has been very stable running Fedora and thus using the latest kernels.
Now waiting for the Ryzen 7840U configured to 15W to be available with 64GB ram.