I love email. In spite of its faults, email is the most reliable way to communicate with anyone, anywhere, anytime. It's been this way for decades. It works.
Email is also a pain in the ass. Email puts anyone at all in charge of my todo list. Clients forward me 30-message email threads with only “Thoughts?". Spam. Reply-all nonsense. You know the list. We've been bitching about email for years. People keep trying to “fix” it or replace it. Good luck with both of those. I'm perfectly comfortable with email. I've gotten pretty good at it.
Today I've been trying Spark to see if any of the modern approaches to email are useful. First impressions are positive. We'll see how “smart” the smart inbox is. I forward all of my email accounts to Fastmail so multiple-account features aren't useful to me. I like “snooze”. Not sure about “Pin” vs “Flag”. It's new and shiny and I'm having fun with it.
The thing I may not be able to live with is not having easy access to individual emails. I can't seem to drag and drop emails into, say DEVONthink. I also don't see a way to link directly to a message. I use links to email everywhere so that could be a deal breaker.
In the meantime, Spark seems clever and pretty. I'll see how I feel in a week or two.