What kind of support are you missing? I run Linux exclusively with an Nvidia card and see regular driver updates (not as frequently as the kernel, for example, but still).
I hope they don't have your master password either. The decryption key sounds like just a longer password or salt with extra steps. What if the generation algo is cracked?
Also, you can go multi-factor with every password manager I know.
2^0 isn't multiplying by zero. Considering this law: 2^a / 2^b = 2^(a-b)
it's obvious why 2^0 = 1
If a=b you're dividing by the same number resulting in 1.
Unfortunately, I cannot explain/prove the first law though.