Hi All -
We do have a small section at the end of our email documentation that makes reference to some of these concepts:
However, its clear from this thread that things can be a lot more clear. @mdburhan3 - I’m particularly sorry to hear about the issue you faced as part of a client demo, and I sympathize with your pain and frustration here!
I’ll be sharing this thread with our product team so that we can think about how we may want to be more explicit about email deliverability rates and expectations with SendGrid. Thank you all for the feedback here.