If you think they couldn’t release faster you are factually wrong. Your own explanation shows it. I appreciate their release schedule, but it can certainly be released faster.
There are a lot of different philosophies regarding this stuff. At one extreme end you have reaper where all development is public and pretty much every test build is released immediately to the public while the official releases come out much slower and thru the official update channel. At the other end you have more of this secret squirrel stuff, very limited or no public betas, no public alphas at all, etc.
It's a part of a publicly traded company, with regulatory disclosures and fiduciary duties to stockholders, so no....they cannot release faster just because smaller companies with less requirements and stakeholders can.
Tell me this: If you're so sure that they can go faster, what would be the benefit to throttling their firmware releases?