I mostly find myself agreeing with what you’ve said about the merits of German aircraft and the ever decreasing skill of German players, though I’d say that this decrease in skill is present in other nations as well, and only so noticeable in German pilots because of their former prowess, especially compared to the Americans, who would struggle to get worse.
That said, I think you are viewing German aircraft with rose-tinted glasses. If they were everything that they should be, and were not facing planes dreamt of by Allied and Soviet propagandists, then your high opinions would be entirely justified. As is, the majority of German aircraft manage only by the mistakes of their enemies, and fall short against any competent enemy flying a similar BR plane in a comparable energy state.
Bf 109s are, generally, either overtiered or face mostly undertiered enemies. They still do well with energy, but either they climb worse than they use to, or the planes they fight climb a bit better, because I notice less disparity in climb rate than I used to. They just aren’t fully competitive, and I’d say that they range from below-average to thoroughly mediocre in actual performance, even though I like their playstyle.
There was a solid period of 2-3 years where I considered myself an Fw 190 main, and if the Fw 190s weren’t in their current state, and were not facing the issues common to German aircraft, then I would likely still consider myself one. As of now, their guns have been nerfed multiple times; they lack the boosters they historically had, to my knowledge; they overheat rapidly despite all historical evidence, objective and anecdotal, to the contrary; their elevator authority is artificially limited; and once again, against all evidence to the contrary, they now compress at high speeds quite a bit more than they used to.
Fw 190s have suffered the fate of Me 262s, and exist now as fodder for Allied and Soviet players. I do not believe they are intended to be playable in their current state, and in my view the deluge of nerfs have passed from the realm of incompetent indifference and into that of deliberate action.
I still mostly play German aircraft, still finding their playstyles more to my liking, and being overall more impressed by the engineering choices in their historical designs. I just don’t fly them with nearly the same enthusiasm or fun as I used to, and more often than not become frustrated after little time playing them; doubly so if I then switch to flying a P-51 afterwards and can feel the difference in performance.