That should be possible indeed. I have done this in a project years ago, but that was with Vaadin 6 era. I’m sure this has been done many times by many different developers. Somebody should implement good universal “@media print” defaults for Vaadin and share them in the Directory. Now that the Valo theme is just out, might be a sane moment to invest for that project. Solution wouldn’t of course fix all inconvenieces of web and printing, but could be “good enough” solution for most modern needs.
Those who want/need pixel perfects prints on all platforms will probably need to continue using some PDF library still for many years on.
cheers,
matti