A) Benchmade does not use a machine to put the bevels on. They use people. Every Benchmade knife is hand sharpened at the factory, so there will be inconsistencies between knives. It's just the nature of how it's done. The problem is that they aren't investing in jigs to help those sharpeners hold a consistent angle. They need to either do more training/get jigs for the folks, or they need to invest in some sharpening machines that will put consistent bevels on and have the sharpening folks run those machines (so no one is out of a job).
B) They have publicly stated in the past that they put about a 25º bevel on each side, so it will be more obtuse at the start and wont' look like the bevel on the Kershaw.
I think it is unrealistic to expect a company to make parts for decades afterwards to service looooong discontinued knives. I managed to swap the blade on my 812s-LH that was made in 2000 just a year ago or so. I managed to get the last left-handed blade they had for the mini-AFCK. Had I broken that blade should I really expect them to have more on hand or replace the knife? Not really. It was discontinued 12 years ago. Besides, breaking a blade would not fall under warranty to begin with, and with a liner lock, I can't imagine parts failing without some kind of abuse -- which would not fall under warranty.