You realize Apple employs engineers right? The same engineers who use homebrew for their own job? If they go down that route, it's likely they'll need to support something like homebrew or similar.

Honestly, it wouldn't surprise me if it just meant distributing package via homebrew means signing the package, much like any other package manager. Yes, you can get something similar with checksums, but it doesn't provide any method of authenticity of the distributor.

Is it friction? Hell yeah. A pain? Yes. Is it purely bad? No. Does it have positives? Some. It's not black and white.