I understand how you feel definitely. I am a person with a poor memory and multiple Gmail accounts... So sometimes I open up my "All Inboxes" folder in the gmail app to discover that I've given the same website multiple addresses and they've sent out three emails to each :(.

With the click notifications on my phone though, I tend to live and die by them (again, poor memory). I use a lot of calendar and scheduling apps, and in that case the design of the notifications is actually really important to me

Those are all really excellent points and part of why I thought the article might be interesting to some of the developers here on Hacker News. A colleague of mine made an interesting point recently. They mentioned that it seems like the companies are really pushing hard on the developers on their teams to build these notifications, and then for marketing to to pile them on in mass. Then the folks who tend to be the most irritated by receiving this onslaught of notifications are other developers working on similar things for their company and not super psyched about it.