Native Apps are Doomed (2016)
medium.com
medium.com
For some category of web 'applications' notifications are a boon so it is good to have the possibility to use them. Apple is slow to implement it as it can be used to make web apps more competitive with native apps, something which they're not that keen on as native apps makes them a lot of money.
It's like that creep you met at a night club who won't leave you alone with txt messages. Sure you were drunk but don't get mad when I don't reply.
As said, I never have (nor had) problems with notification spam for the simple reason that only allow notifications for sites which need it. I don't have problems with spam because I block the stuff, I hardly see any advertising as I block that as well.
Communications is an adversarial field, there are those out there who'll try to get their message across by any means. Whatever way you choose to limit their access to your eyes and ears (and other sensory organs, and eventually your brain), there will be trade-offs. As an example I choose not to have a television in my house as that medium has been entirely taken over by adversarial parties. I do have computers of all sorts which connect to the 'net even though those are also being targeted by those parties. In contrast to television the computers give me the means to tailor the communications to (what I perceive to be) my wants and needs without needing to allow too many other parties access to my time and attention.
"From now on, I refuse to consider the right tool for the job."
Only the Sith deal in absolutes.