I would still avoid 1 A/K even on a 747, but I’m glad some like them!
It is not normal for a Gold to be able to bump anyone out of an allocated seat, though I have had people travelling with me (on my PNR, and therefore able to book row 1) bumped for Prems/a Head of State (though nowhere I’d ever heard of!).
My understanding from speaking to Special Services is that this is only done as a special request, and not as a matter of course.
The Head of State was a charming chappie, buut we had to google him before take off to work out who it was!