On Android, they tried to improve this by adding notification channels[1] (aka categories). Channels are mandatory, and users can turn each channel on/off in system settings.
The problem is few apps assign meaningful or useful channels. Instead:
(1) Some apps use the dark UI pattern of putting important notifications and junk/spam notifications together in one channel. They use the ones you do want as leverage to make you see the ones you don't want.
(2) With some apps, they just don't make an effort. For example, the JustWatch app has two channels: "Default" and "Miscellaneous". The KAYAK app has two channels; one is called "Offers & promotions", and the other is also called "Offers & promotions".
(3) Defining useful, meaningful channels is actually a bit of a UI challenge. Some apps try but don't divide things up in a useful way. The Meetup app has a ton of channels, including 12 at the top level and 3 for each Meetup group that you're a member of. They made an effort, and it helps some, but it's a bit overwhelming.
The problem is few apps assign meaningful or useful channels. Instead:
(1) Some apps use the dark UI pattern of putting important notifications and junk/spam notifications together in one channel. They use the ones you do want as leverage to make you see the ones you don't want.
(2) With some apps, they just don't make an effort. For example, the JustWatch app has two channels: "Default" and "Miscellaneous". The KAYAK app has two channels; one is called "Offers & promotions", and the other is also called "Offers & promotions".
(3) Defining useful, meaningful channels is actually a bit of a UI challenge. Some apps try but don't divide things up in a useful way. The Meetup app has a ton of channels, including 12 at the top level and 3 for each Meetup group that you're a member of. They made an effort, and it helps some, but it's a bit overwhelming.
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[1] https://developer.android.com/training/notify-user/channels