I agree with most of your statement other than the last part.
When it comes to hosting, typically it is best not to ASSume. It's better to ask, or on higher end commitments have a contract so it's all spelled out and there is no confusion.
Personally I think one should assume that all bandwidth is burstable, unless told otherwise. My last hosting company used to do 10 or 100 all you can eat capped, or above 100 it would be metered capped at 1.5x your commit level.
When it comes to hosting, typically it is best not to ASSume. It's better to ask, or on higher end commitments have a contract so it's all spelled out and there is no confusion.