A lot, in fact most, of the default aircraft, I rarely use. I love the bush taildraggers and don’t need to scroll past airliners or most of the tricycle geared planes to get from the XCub to the Savage Cub. But everyone’s preferences will be different. Airline aficionados don’t need to see the planes I like, for example.
Why don’t you simply uninstall the aircraft you don’t fly?
AFAIK the only aircraft which can’t be uninstalled are the TBM and the 152.
It does seem strange that they never thought of a favourites system.
As a workaround this would work, but it’s a bit extreme when a simple tweak to the UI would be the more elegant solution.