I've been on this hunt lately as well, but because I want to believe there could be a suitable option for a Linux tablet ...
Regardless, for just a new thinkpad the X1 carbon has remained a solid choice for all around work-flows (research, student, development, business, etc.)
Big agree. I tried to make jellyfin acceptable for a while and life with audiobookshelf is just so good. https://github.com/advplyr/audiobookshelf