[0052] Expound on Top 16Bit proposal benefits

[V-FEXrt]

Which proposal does this relate to?
https://github.com/microsoft/hlsl-specs/blob/main/proposals/0052-experimental-dxil-ops.md

Describe the issue or outstanding question.
Incorporate the info from #729 (comment) into the Top 16Bit proposal