I have never seen someone do this before and I think that it looks even worse than the cover plate they were trying to avoid using. Hopefully the switch works forever and doesn’t need replacing.
https://www.nachi.org/forum/attachment.php?attachmentid=157709&stc=1&d=1476101742
LOL…Hey…they said fill the gaps. The mason simply does what he is told…lol
Looks like the cutout in the tile was pretty good. 
I like it! Saves time screwing those stupid cover plates on.
Nice!
Wow.
On the bright side, no arguments if the cover plates should be white or off white. lol.
No more loose or broken cover plates…nice.
Somebody needs to patent that 
Is the yoke adequately supported?
Only the Tile guy knows that…
