The last time I worked as a CTO I bought them for the whole team. Being able to redraw things on a shared digital white board beats having to redraw the same 4 boxes a dozen times because you keep running out of space.
Also saves people taking photos of the white board before erasing.
I have to say, that's pretty damn cool! I'm such a fan of diagramming code and systems, so having this for everyone on the team I'm guessing would have done wonders!
I now have a A2 paper notebook (I think it's actually supposed to be used as an artist's sketchbook) permanently next to my keyboard (my mouse sits on it) and I can't imagine living without it now... but a 24" pen display, mindblown!
4k and quite affordable. And it's a real screen the rest of the time.
Like I said the main quality of life improvement has been xournalpp. Development in the last year has taken off and it's one of the most pleasant projects to contribute to.
Digital whiteboarding tools are close, but I think they miss some of the magic of working in a shared space with an analog too.
I can make more complex drawings in excalidraw than I could on a really drawing surface. I suspect that leads to simpler drawings and thus simpler designs.
Working on an architecture with a peer and marker really led to some elegant class designs.