Phish at the Sphere was always going to be wildly different compared to U2’s opening residency at Las Vegas’ immersive venue. Both bands are known to push the boundaries of live performances. But they’ve rarely approached it the same way. U2’s 40-show Sphere run was a polished, extravagant rock show with (nearly) identical set lists the whole way through. The Sphere was a perfect canvas for making rock stars like Bono and The Edge…