All those things are true for me as well but you're comparing 4 years ago technology as apples to apples with regard to sensor technology and you're other comparisons are comparing technologies 15 years and 20 years or more apart.. the technology will keep moving as you so aptly say, yet so many seem unsatisfied that it doesn't move on fast enough... I see the future sensors continuing to evolve in pixel density and pixel quality... let's see what we think in another 11 years! We'll probably be blown away!DXO tells us the sensor is useless, yet somehow people manage to take great pictures.
I managed to take great pictures 15 years ago with my SLR and yet I use DSLR nowadays (beyond micro 4/3).
I managed without mobile phone 20 years ago but I use it continuously nowadays.
Technology moves on. Not so Canon's APS-C sensor tech. They are still living in 2009.
The 18 MP is perfectly fine for me and I think for the most (the last thing I'd wish for more MP with Canon's sensor tech from 2009) but hopefully they improve the per pixel quality.