That was absolutely not worth asking us to take our time to scroll back just to read an insult. And it undermines the value which WAS in your initial post (there is value there, though only for the next generation).
I am sorry that you appear to be taking things personally. That means it is unlikely for anything productive to happen here, when something productive could have happened. You should possibly read that first post yourself, and understand in what way it pertains to yourself. I am not saying you are the only one attacking, but that update is quite clearly an attack. Sit for a moment and think about what you are afraid of in this case.
As for WHY there is not a larger passthrough… because space is limited.
A laser tube is large. It is also delicate. It also exists in the machine somewhere. Sit down with CAD and the dimensions of the Glowforge for a little while, look up the physical dimensions of a 45W laser tube, and the mounting hardware for one. They are rather consistent.
Now… design your own GlowForge, and make it have a full 1.5" door possible in the back. The front is easy, it already has that much space available, and dan himself has said (likely his lawyer is yelling at him for having done so) that you can bypass the safety interlocks to have a large front entrance by leaving the door panel open.
The back however… you have to get under the laser, and you have to not risk breaking the laser. This risk is not just from your material passing under the laser tube, but also from removing all support structure from below the laser in order to have that space completely open for material to pass through. Laser tubes have this odd tendency not to levitate.
Without changing the outer dimensions of the GlowForge… please modify the internals so that it continues to work, but allows a larger passthrough.
Should you manage to do this… please share it here. I am sure that dan will happily incorporate your designs.
The easy counter, which you are likely to resort to since you already have shown a desire to attack people instead of discuss ideas, is to tell ME to provide you with a CAD that shows how you cannot fit a larger door there. So I will respond now: I already know it cannot be done, but am willing to be shown that I am wrong if you know something I do not. You do not know that it CAN be done, you are just screaming that you want it, and so it should be.