As a flatlander who likes to climb, I’m always on the lookout for some mechanical advantage which can make it easier to get up the hills. SRAM’s 11-36 cassette is an obvious way to do that, but officially my Shimano R8050 (R8000 should be the same) rear mech only supports up to 34 in the back. Having tried the Ultegra 11-34, and not being a big fan, if this works. It seems a great way to get better gearing.