I wrote a bit about this [0] in terms of exploring Dell and Lenovo as options with a focus on Linux. I also quite like using LTE with my development machine, I'm doing so with the T470s and Fi [1]. I feel like for Linux the primary advantage that Lenovo has is the historical RedHat/IBM partnership where many RedHat developers are issued/choose Thinkpad as their primary machines to hack on. This typically leads to the crowd effect in ensuring the hardware has good support.
I think the thing that makes me the most sad about Lenovo and Dell is the two incidents they've had in relation to consumer privacy [2][3].
This is awesome, thanks! The biggest problem I had with even considering Linux on any of these machines is that the High DPI support is... non-existent, which just kills it for me :(
I think your information about High DPI support with Linux is outdated. I've been using a 4k screen with Ubuntu for more than a year now without any particular issue.
One of the things I feel is important is matching your external displays with the internal one, the 1440p in the T470s matches up with all of my displays at every desk I work at. This makes it pretty easy to move around and feel comfortable.
So 1440p is fine, but once you end up in 4K territory it's nigh unusable. They've barely started on fractional scaling, so your choices are big or even bigger.