I understand the advice, but I don't agree they're entirely without purpose.
> I have never seen them used for any legitimate or useful purpose
That's definitely overblown. I've got a half-dozen enabled, and on re-reviewing that list, I still think they're legitimate. Upon checking mine, I've whitelisted Google Calendar, Gmail, Google Meet, Mattermost (work chat app), and Slack, and I want notifications enabled for all those things.
> I have never seen them used for any legitimate or useful purpose
That's definitely overblown. I've got a half-dozen enabled, and on re-reviewing that list, I still think they're legitimate. Upon checking mine, I've whitelisted Google Calendar, Gmail, Google Meet, Mattermost (work chat app), and Slack, and I want notifications enabled for all those things.