You're right. I think it's not so much due to anything about the style of bike, though, and more that bikes at that price level are still 8-9 speed and there's fewer 1x solutions. You're going to see more in the future. SRAM now has 1x systems at all their road levels, and with optional flatbar shifters, and they recently announced a mountain group that is cheap enough for $1000 bikes and goes on Shimano freehubs. Meanwhile, bike companies haven't been waiting for component companies to push 1x systems down the lineup. This year there were quite a few new $1000-1500 level MTB's shipping with the big new Sunrace 10-speed cassettes, house-brand cranksets, and Deore or X5/7 level shifter and RD. Those groups aren't 1x yet, but people want it now. Hybrids are (probably, I'm guessing) the next step from there, since they've always been sold with MTB-derived parts.