I just killed all Sprint bands on my note 10 plus and immediately latched onto band 66 upon restart. Although the speed test initially spiked to around 11 Mbps it did quickly throttle back to about 5 Mbps.
Seems like the Pixel 4 XL LOVES to hold on to B41. Makes me wonder if the Pixel 2 XL actually supported HPUE.
It seems like the performance of the Pixel 4 XL > Pixel 2 XL.
Faster speeds, never falls to 3G, better radio performance overall!