Comment by delta_p_delta_x

> It amazes me it’s so hard to find monitors around 210+ PPI.

You're in luck; several 5120 × 2880, 600 mm × 340 mm monitors at high refresh rates were announced at CES a couple weeks ago.

  MSI MPG 271KRAW16
  LG 27GM950B 
  Acer Nitro XV270X
  HKC M9 Pro
  Hisense 27GX-Pro

And many more.