Please, stop repeating russian propaganda. They wanted to control and reconquer their former imperial colonies. Their claimed Casus Belli were just lame excuses, not actual reasons.
In practice, light gathering correlates to F-stop quite well on most normal modern lenses, transmission losses are very low. The main exceptions are deliberately apodized lenses, which have considerably transmission losses wide open.
For the rest - yeah, f# is just one of important specifications.
He took 3 photos with different colour filters in succession and captured them on large glass plates. Naive alignment possible before digital technology limited the quality of results, but as original separate negatives survived - it was possible to scan them at high quality and properly align digitally. So now we can see those photos in true colour and high quality.
As one of examples a very vivid photo of Emir of Bukhara taken in 1911:
Not just now - EU has pushed for a common phone charger previously and most manufacturers went with Micro-USB at the time, except Apple. Now, EU is just pushing that further with less loopholes.
As for the time between adoption and enforcement - there has to be reasonable time given between for everybody to adjust to the new regulation.
Wow, somehow never thought that the device is named after the fruit. Their names can be even closer in other languages, f.e. in Russian they are nearly the same word, just different genders.
It will go from comedy to tragedy, as somebody will eventually get arrested and even convicted based on high quality picture of their face upscaled from 16x16 noisy mess of pixels.
It's tragicomedy. Their justifications are the comedy, while their attacks on people and operating a nuclear power plant so close to the border is the reason for worry.
The market is moving towards MILC, including Canon's and Nikon 's top sports bodies (R3, Z9). With fast sensor readout and improved processing power, they will focus better than 1DX3 and D6 in most circumstances. Both with grips and larger batteries. They won't match DSLR at idle battery life, but the differences in shots when taking many bursts will be much smaller than CIPA suggests.
Technological replacement happens when new tech has important advantages over the old, without needing to outperform it in every single way.
Diffraction is a property of light, it still happens in vacuum. The air turbulence can cause image degradation, but it requires many meters of it to become noticeable and is a complete non issue within tens of millimeters inside the camera.
The main reason for the improvements in quality - closer (and for some - larger as well) mount allows more freedom for lens designs, leading to previously impossible approaches. Another change - with photographer never seeing a direct image from lens (only a processed one via EVF or back LCD) - the abberations that can be easily corrected in post can remain less corrected by lens design, allowing better correction of other parameters within the same constraints.
