RGBA sucks

There are (assuming 8 bits per colour) 2^24 combinations with full transparency. This is even worse than https://dis.tinychan.org/read/prog/1457531769

https://en.wikipedia.org/wiki/Rec._2020
http://www.dell.com/learn/ai/en/aicorp1/secure/2017-04-20-dell-announces-new-hdr10-monitor-with-uhd

Displays with 80-85% of Rec.2020 this year, but they cost $1800-$2200 for 27"-32".

10-bit and 12-bits per color channel depending on the technology (image buffers have 16-bits per color channel, either 16-bit unorm or 16-bit floating point for HDR rendering).

So granted that money is not a barrier, what would you prefer of the following?

1440p 100% Rec.709/sRGB 144Hz TN/VA gayming?
4k 85% Rec.2020 8ms GTG 60Hz IPS professional?
Both?