What went wrong why didn't SED Replace CRT?

[Supermodel_Evelynn]

https://en.wikipedia.org/wiki/Surface-c ... er_display

SED a type of CRT tech but an evolution of it allowed flat slim CRT style TV for it's time it was very slim like any LCD display and being a branch of CRT technology I guess that meant no persistent blur, no garbage backlight bleed, viewing angle issues, input delay etc
CRT had virtually 0 input delay even on 60HZ.

So how did this technology die? was it because phosphor was too dangerous and toxic to handle? I can't think of anyother reason for killing a tech 20 years old that's still better than anything we have today.

SED was NOT sample and hold and it used a grid of nanoscopic electron emitters, one for each sub-pixel of the display. These emitters "fire" electrons directly at the phosphor, eliminating the need for a bulky electron gun and enabling a flat-panel design.

For example SED and CRT you could use real life looking guns to aim at the screen and shoot targets with 0 input delay.
I had one on my NES
I got it free with the NES and I had a game called Duck Hunt, I wonder why you can't do the same with modern displays?
What made CRT so special you could use this optical gun to aim and shoot?