Welcome Michael,
I have many Moodle sites because we operate on a per school site, and we have xxx of those. We are looking for horizontally scale-able infrastructure. Yes, your morning load is a perfect example... we would like to have flexible number of running containers running off a cluster of machines and the ability to adjust the number of machines and containers dynamically per the load at any point in time. T2 unlimited is just a variant of T2 instance... we do not care about the type of instances running the cluster, we care about the efficiency, we would like to pay $$$ just for the resources we consume.
Cheers