There's a high end LED video wall at my local Apple Store and I was able to walk right up to it. Very impressive. The light modifiers blend the LEDs together very well so I was not able to discern individual LEDs. Even though the display faces the outside glass curtain wall, there was plenty of contrast in the image. They were using it for the in-store teaching sessions. This was in The Before Times, of course.
Linus of Linus Tech Tips considered acquiring Samsung's The Wall MicroLED display as the ultimate YouTuber showoff piece. He was dissuaded from moving forward for multiple reasons. Experienced installers informed him of the extreme power, cooling and building structural requirements. Also, frequent replacement of modules due to failure is to be expected. In fact, the sell sheet for LG's competitive product mentions the inclusion of on-site spares in the package.