Their service limits start low and ratchet slowly, if they have the capacity to give.
All these features and elasticity sound nice until you get big and they don't deliver.
I don't know what an AWS TAM is but the SAs have tried and failed.
Make a new account and try to run 1000 c4.4xl in parallel for 1 hour. It won't happen.
That's not what happened the five times, but it's illustrative.
And who defines what is a need and what is a want?