Comment by pjmlp

There are so many blockers, versus old style Flash games.

Driver and OS blacklisting, means that game developers aren't aware of the user experience, nor can they controll it, as in native games, or server side rendering with streaming.

No proper debugging tools other than printf/pixel debugging.

The amount of loading screens that would be needed, given memory constraints of browser sessions.

This alone means there is hardly that much ROI for 3D webgames, and most uses end up being in ecommerce, or Google Maps kind of applications.