I'll throw in my opinion here only based on my experience. I have ridden my 1X10 (44X11-28 10 speed) cx bike for racing cx and gravel. It worked great and I loved the simplicity. However, this fall I got a dedicated gravel bike that is also serving as my winter training bike( I race mtb and road as well). After a few long gravel rides, bike packing adventure rides, and local group rides, I love the fact that I now have a 2X10 (50/34 X 11-32 11 speed) ! Those small changes in gearing allow me to find my groove. This was very beneficial to me at mile 110 with lots of hills and gear! Food for thought! I feel for CX racing, the 1X is the bomb though!