A37575
It's not what's in the the drill that is the problem, it's how it's used.
I prefer the one drill that covers most light aircraft, fixed or retract.
When you get to the "Undercarriage" part of the drill it should be "Not required" for fixed gear and "Down and locked" for a retract, not the same response for both situations. That way pilots are trained to think (hopefully) a bit more about what they are doing.
I do see where you're coming from however if you do it the way you suggest there is still the risk that a pilot newly converted onto a retract will, in the heat of the moment, use the "old" drill and forget the "undercarrige" check entirely.
In other words either way can be said to be better or worse than the other.
TooLowTooFast
I would think a gear failure which is what your'e suggesting would have resulted in a rather more "exciting" outcome. It would be unusual for all three gear to collapse evenly, therefore there would have been quite different runway marks from those that have been mentioned.