As the author of the post... :) We don't see this as bad news, quite the opposite in fact. Feature detection (if you're running JavaScript), Client Hints (if you're running code at the edge), etc are all a lot better to use for logic decisions. We've been making changes to rely less on the UA header directly for our Akamai products.

Our goal of the post was more around educating our customers, who may not be aware of these changes, and these changes can affect their custom logic, if they depend on the UA.