They've had... 7+ years to think about it and come up with a plan. Part of the plan was let everyone abuse the branding and give every manufacturer the ability to say "Android!" while giving
0 assurance of current version of upgradability. And we got years of cheap android devices that were, by design, legacy and non-upgradeable.
Perhaps, maybe, in a few years, policies will change enough to say "if you use this brand, you have to adhere to these policies" and maintenance and upgradability will be a required policy. But... the effects of that will be years in to the future - there's no real change in the near term.
Google seemed to intentionally ignore that aspect of licensing, and... somehow we're all collectively dismayed that hardware manufacturers chose their own short term profits over the impact to the Android brand?