It does help a bit. I still don't fully understand when it's a frame or a reach.
So it's not really a distinction between a frame and a reach, but between a frame and a lever. As I explained in the other video, that comes down to the direction of force being applied. If the force is directly in line with the long bones of your skeleton, then you have a frame which can absorb the force and transmit it to the ground without excess muscular effort. If the force is applied perpendicular to your limb, then it becomes a level which your opponent can use to manipulate you.
How this ties in to reaching: the further you extend your arm or leg, the more leverage your opponent has if he can apply force at that perpendicular angle.
Also, in a short frame you're only absorbing force primarily along a single bone - your humerus or femur. Once you extend your arm or leg, then you add additional joints into the mix (elbow & wrist or knee and ankle) and you have to make sure you're careful with your alignment or the structure becomes weak and you have to use muscle to compensate.
Finally, if your opponent is resting his weight on your frames, then you should be able to feel how he shifts his weight in an effort to create levers and you can work to adjust your angles to negate those attempts. If your opponent was holding his weight back and you reached out to make contact, it was probably a simple matter for him to disconnect his body from your attempted frames, take hold of your arms, and move them sideways to put them in a position where you could no longer make frames and you were open for the americana.
I think this would be helpful
I'll see if I can get some half-guard material recorded in class tomorrow. I've started thinking about how to put together the initial grappling with weapons video, but I had to order some extra rubber knives so that I would have enough for the whole class. I'll probably get that one posted next week.