I can just about understand your argument that 16:9 is better for entertainment purposes. But this statement is a step too far.
Productivity apps do not enforce a screen ratio (or FOV). Therefore the difference is purely in screen area.
A 1920x1200 monitor has more screen area than a 1920x1080 monitor. More area = better. Simples.
A 16:9 ratio is not automatically better than a 16:10 ratio when you consider the reality that currently gen 16:9 screens are smaller, cheaper versions of a 16:10 monitor.
If the height was the same, the 16:9 screen would be bigger and arguably better. But since it is the width that is the same, the 16:10 is bigger and better.