[micromacrofoot]

That seems like a good guess. I'd also guess that there are a lot more internal politics involved when they're implementing OS-integrated features that are easy to abuse. There are a lot of sites that ask for notification permission that definitely don't need to, and that probably saps some of the motivation for implementation at Apple. It's frustrating for developers with completely valid use cases, frustrating for open web standards, but I can understand being overprotective of user experience. It's a difficult balance.