Just ask yourselves these very basic questions. Why wait for Ukraine to lose this much land, manpower, and infrastructure? Why wait for the population to be so demoralized and for the military to lose its combat cohesion and for so many millions to immigrate out of Ukraine? Why constantly delay the delivery dates of the F-16s? What runways are even left to host these planes inside Ukraine? Do some deductive reasoning. Russia has stated that they would consider the F-16 a nuclear threat and consider an enemy, any country that these F-16s take off of towards Russia.
The US was banking on Ukraine to weaken Russia, but all they did was make Russia stronger, richer, gave them invaluable combat experience, increased their MIC production capacity to a point where it is higher than the entire production capacity of the West. Lastly, Russia has now tested all its nuclear weapons delivery systems successfully, tactical and strategic.
Russia has the largest nuclear arsenal in active service and in reserve, and arguably the best delivery systems, and their doctrine states clearly that should Russia face existential threats such as attack on their cities with nuclear capable fighter jets, they respond with said weapons. Top that off with the fact that Russia has a vast network of nuclear shelters and the largest landmass on the planet, giving Russia the highest probability of winning a nuclear war and providing for even more motivation to use their nuclear weapons if pushed far enough.
You need to take the nuclear capability into account when you make your analysis. These weapons aren't there for a picture frame. Imagine saying something like "The Mexican army is taking out Patriots and THAADs, clearing the path for their Su-30's not only to be able to conduct sorties over the fronlines but to loiter over them". It would sound so comical, simply because it doesn't take into account the US nuclear capability. Stop pretending Russia is a conventional power.