You can safely assume the bursting itself is badly implemented on shitty ISP modems and causes spikes of high packet loss and latency when it switches. Say you

You can safely assume the bursting itself is badly implemented on shitty ISP modems and causes spikes of high packet loss and latency when it switches. Say you're bursting 1gbps on a connection with 100ms latency. That connection squeezes to 20mbps suddenly. In the best case in those 100ms that the sender cannot even react to the change, we receive 10mbytes. Those 10mbytes that now have to be throttled away either get dropped or end up in a buffer. Now you either have a 5 second backlog latency or massive packet loss for 100ms while this resolves. And things overcompensate. And worst case, you end up in a oscillation pattern, the throttle goes off, and you burst again. This happens and is measurable.