You probably know all of this and are just irked because you can’t get what you want and get it right now. I’m the same way. But in case you’ve not been around small manufacturing companies…
It’s all about production runs and reserve stock. Carbotech has to be making predictions months in advance on how many of each type of pad to make, coord with their supply chain such that materials arrive about the time that they are needed, and when it’s time their production line spends a couple down hours reconfiguring for the new pad type. A small outfit like that probably only has two production lines, and there’s an assload of different pad types.
In order to survive a company has to have lean production costs and a only a small amount of reserve stock. But the downside is that if demand goes up faster then predicted it can burn thru the reserve.