I thought I saw something about a new fullsize that didn't have a plate, but I think it was a plastic plate instead of metal. You will find PCB mounted switches in the Pokers and KBT Pure. For larger form factors they are most often found in Cherry (and other OEM's) SPOS boards. The nice SPOS boards, however, are usually reinforced with a metal slab on the bottom. So, not plate mounted, but still a substantial board.