Context: was looking for a decent service to give me a calendar a little while back but one thing that kept stopping me is there seems to be absolutely no service that just offers you a nice calendar, its only email services that happen to offer a calendar on the side.
I don't want another email. I have enough, and my current one is tied down to gmail (but I'd prefer if my calendar wasn't).
I'm sure there must a historical reason for this, but also why is does it still persevere?
One is a scheduling and time management thing, the other a communication system. I don't need to sign up for a messaging app to have a todo list.
Really can't tell you where it came from, but which part of the google calendar integration with gmail doesn't work for you? I'm quite happy with that.
But have a look at tweek.so, they are a calendar & task planner without email service, and free for personal use.