I tried this a couple of years ago and had to ditch the TV because of too much input lag.
You mention input lag only once where you say:
> Although this post is mostly focused on productivity, most if not all 8K TVs can be run in 4K at 120 Hz. Modern TVs have decent input lag in the ballpark of 10 ms and may support FreeSync.
Have you measure this, or where do you get this number from?
The TV I bought was also advertised as low-latency, but I found it too high in practice (when typing in code, or scrolling, and waiting for the screen to update).
You mention input lag only once where you say:
> Although this post is mostly focused on productivity, most if not all 8K TVs can be run in 4K at 120 Hz. Modern TVs have decent input lag in the ballpark of 10 ms and may support FreeSync.
Have you measure this, or where do you get this number from?
The TV I bought was also advertised as low-latency, but I found it too high in practice (when typing in code, or scrolling, and waiting for the screen to update).