yr right,
Go find yourself some diagrams of a sleeve valve engine, ( such as Bristol radial aero engines or Willys cars, to name two) there are NO valve seats. Likewise the rotary valve car cylinder head built here in Australia in the late 1950 to early 1960's had no valve seats.
I do not believe there is any such thing as a poppet valve with a rotating seat. If you claim otherwise, facts please, not more bluster and assertions.
Tootle pip!!
PS: It was the Beaufighter that as known as the Whispering Death, there is nothing quiet about a Bristol Hercules or Centaurus on full song ---- and before you ask, I do have direct experience of the Centaurus personally, I am not speaking theoretically.