I think this is mostly to blame on Grafana. Every dashboard ships with $__interval by default and every query uses that by default. I never understood the value of that. It makes the graphs look pretty I guess, but looking at the values becomes a little less useful because nothing is compareable to another not even to yesterday when you last looked at the dashboard.

Personally I always setup a variable $interval that can be set to 1m, 5m, 15m etc and use that in all my queries.