The recommendations do not work since they are not enough to counter the smaller pixel size. if you cut the pixel size in half, then you will have to open the aperture by 1 stop, meaning a 1.2 aperture. That makes focusing extremely difficult. You can try a f1.2 lens with a camera with one of the most advanced auto focus systems (the Nikon D4s) and you will see it miss a lot of shots at f1.2
The wider the aperture, the more difficult it is to focus. It is also exponentially more expensive to make the aperture larger, as it requires more glass, and the yields are far lower in terms of getting multiple large lens elements without defects.
Noise reduction is never a solution to a sensor with more noise. The more noise you have, the less detail you have which is why you get less and less detail as you increase the ISO. Noise reduction, reduces the visibility of noise, but it does not add detail. You cannot recover data that was never in the image to begin with. (smaller details require a higher signal to noise ratio in order to display them.
There is no good solution around just having a larger sensor. more photons per pixel, means that there is more photons for the sensor to work with.
Megapixels mean nothing if the camera is unable to deliver on the resolution, this is why you can often get far more detail from a 5 megapixel DSLR than from an 8 megapixel smartphone camera.
If you look at many camera reviews, you will often see a resolution test which works to find the effective resolution. When done on smaller sensor cameras, e.g., point and shoot cameras, the effective resolution is often 1/3rd or less of the resolution of the sensor, while some of the higher end DSLR's can come within 90% of their sensor resolution.
As the ISO increases, the effectively resolution drops at an almost exponential rate
No camera today can deliver an effective resolution that is equal to the sensor resolution. Perfect is optimal use of each pixel to display as much detail as possible, and that is only attainable from a 3D render where everything can be made pixel perfect.
PS, if needed also look at some f0.95 aperture images, and you will see that it also distorts the image because it is incredibly difficult to make larger apertures.