Higher PPI is more important, not less, as your eyesight degrades. Turns out pixelation is bad for your eyes. The advantage to having a higher PPI is that things are clearer, not smaller as some windows aficionados have come to expect.

Nobody is significantly investing in desktop pc display technology right now as far as I know, not samsung or LG, it's very stagnate. That's the point, PC R&D seems as good as dead. It's a big shame, I would really love a decent display for my workstation.