I would venture to say that the majority of scrollers bottom feed. So the bottom blade clamp on the new Jets should not be an issue. It actually is nice that the clamp is removable for loading. I would have several pre loaded.
I prefer a removable clamp to the ones that are fixed in the saw.
I agree with Len in that I don't like a lot of fiddling that is why I bought a Hawk 11 years ago , Top and bottom feed, the arm stays up by itself, cheap removable clamps, bullet proof and powerful.