I am on the fence about notifications though. They can be very useful for the user. I am planning to add notifications, but probably all off by default, and the user decides very granularly what they want on. Does it seem the right approach? I would appreciate any opinion
I'll give a lot of thought into the UX of this still, specially around the trade-off customization vs simplicity.
Digests are good for simplicity, and I like it. A simple opt-in setting and you are all set.