Jeez Velrun, I don't know if that was your intent, but your post comes across as extremely belittling and I would be pretty tilted if I were Chris.
See, Chris actually made a post with zero negativity whatsoever, and moreover he actually makes some fair and interesting points. While there is a difference between sturdy and spell shield, in the context of kill spells, both need two, and that's a perfectly fine analogy to make. Of course sturdy offers broader protection, but if anything that does the opposite of invalidating his argument. If in his environment people were willing to spend two removal spells on a card with sturdy, I'm pretty sure they would be willing to do so on a creature with spell shield as well. That does not invalidate your experience with the mechanic either, it just adds to it. In other words, whether the ability plays out differently from full on hexproof depends heavily on the cube and the group playing that cube.