Another issue is surface mount versus embedded. A lot of guys just want to slap something on top of the layout, for any number of reasons, be it limited ability, or something lurking beneath the surface that's either in the way or inconvenient (like a foot of foam). But you can hide a multitude of sins (or a small refrigerator, if necessary) under the layout, which opens up all sorts of possibilities.
A while back I'd developed a ground throw based on a micro-mini toggle switch mounted vertically. All that showed was the tip of the switch. But it had a mount larger than most standard-sized slide switches, and that proved to be a big turn-off, even though the mount could be completely disguised with ballast.
It is a vexing little design puzzle, to be sure.