I just replaced my ancient Thinkpad with a Hi-DPI Lenova Yoga 2 Pro.
QHD+ screens are finally arriving in PC laptops and make text much
nicer to look at. The Yoga is the cheapest, but there are a number of
models on the market and more on the way.
In general, LibreOffice works well but has a few issues: the most
noticeable is that the toolbar, status bar, and Navigator buttons are
not big enough. You need the steady hands of a sober surgeon ;-)
Setting large icons helps a bit, but only with the toolbar, and they
still aren't big enough. Scaling the UI doesn't help at all as it
doesn't scale buttons.
Perhaps it would be good if the buttons were based on the size of the
system font? AOO does a better job, they don't even need to set the
large icons. In fact that option makes them too big. Maybe there are
some patches that could be grabbed? There are just a few big usability
issues, and a number of little ones: the startup screen is too small,
the start center cuts off the text, the mis-spelling underlines are a
little too hard to see, etc.
I am willing to setup a task on Bounty Source and chip in $100, but
maybe TDF can consider to donate a new laptop to a volunteer who
promises to work on the issues? Someone donated hardware to a Gnome
developer and they got some fixes into 3.10 because of it.