No weirder than the 1D X having 18 MP vs the 5D3's 22.3...They desperately need to go up with megapixels, as even the cheapest model is 18Mpx. I hope they´ll go 24-32Mpx for APS-C and 40+Mpx for 5D class FF body.
That ship has sailed on APS-C. The 7D2 is the last flagship APS-C rig you'll see for quite some time, so 20 MP is all we get.
Besides the obvious "Only +2 MP over the 7D?" first blush response some folks had when the 7D2 spec list dropped, there is the longer term 'king of the Canon APS-C spec sheet' problem. Though Canon's crop world will likely proliferate one of the two 20 MP APS-C sensors to the lower trimlines over the next 1-2 years, it might get weird when a T8i or 90D comes out with a 24 or 30 MP sensor and the 7D2 is still sitting at 20 MP.