How was the Sphere? My friend who lives in Vegas went to the U2 opening show and said it's nothing like you've ever seen before.
I went opening night and it is nothing like you've ever seen. HH is correct about the sound. it's really difficult to properly explain the clarity. The visuals, while stunning, were developed before the place was built. Now that they can test live, future acts will be able to do a lot more, but good luck finding someone who can front the cash for such a one off venue and sell out enough shows to make money.
We spent most of the weekend trying to figure out who could. Most big names are touring stadiums or similar size arenas. Why spend the money? Other residency acts are selling out 2-3k seat theaters. U2 is probably the most tech friendly band of the last 50 years and they worked hard to fill the space from a performance standpoint. You need to be a big time stadium level performer towards the back end of your prime.