Hm. Maybe we need a system for mail and messaging which puts most items into a bin to be read later. Once every N hours, it shows you the "later" items.
(One real headache is the demise of third-party messaging clients. You can't write a Twitter client any more, or a Facebook client, or a WhatsApp client, or a Slack client. This is a big problem, because the vendor clients work for the man, not for you. With email, you're still in control, but not with the proprietary systems.)
I imagine that this could be done on android by batching notifications for display at specified intervals. Not sure about iOS (without jailbreak) though.
(One real headache is the demise of third-party messaging clients. You can't write a Twitter client any more, or a Facebook client, or a WhatsApp client, or a Slack client. This is a big problem, because the vendor clients work for the man, not for you. With email, you're still in control, but not with the proprietary systems.)