I love Spydercos but let's be honest, at least one of the big reasons to move the hole to the trademark is to grasp onto any further protection they can get from other knife companies using it as a functional feature on their knives. The fact that the hole wasn't used on past fixed blades shows that in the past, Spyderco viewed the hole primarily as a utility component. Certainly, they could sincerely think of it as a bona fide mark that represents they're brand now, but interestingly when the functional aspect was protected, they didn't think it was all that important for brand recognition for their fixed blades.
IIRC the point that pushed Sal over the edge (to putting holes in fixed blades) was when he heard that there were Mexican knifemakers doing it "because it was a sign of quality".
I'm pretty sure that qualifies as a trade mark.
It's not like all the other shaped holes are any less functional anyway.
Oddly enough, I've learned that the opening hole is more annoying than it's worth a lot of the time. If you're cutting deep into something, the hole binds in the material. It can get stuck pretty bad if you're not careful.
I love thumbstuds, as long as you don't have to put your thumb on them. The idea of an external stop pin is genius, it's virtually impossible to get all gunked up.
So what is my preferred opening method? The flipper of course! It's fast, fun, and acts as a guard to keep the blade from chopping your fingers off.