Not really sure where the logic from this conclusion comes from.
In this update, the UK just received 2 variants of one of its most famous post war aircraft.
And the rest of this year so far. A top rank jet in every update so far:
Also with 2 event vehicles this year:
WW2 had almost 4-6 years of undivided attention. There is only so much we can add from that era that keeps people interested and engaged.
It was very clear the community as a whole preferred an expansion upwards over an expansion of a lot of aircraft that don't interest everyone.
We are still adding WW2 content, but it is indeed correct to say its no longer the main focal point of development.