There are some pretty good videos posted from this year's Wireless Lan Pro Conference. Here's one that shows why throttling bandwidth to control application might not be a good idea.
Very similar to how modern CPU's are designed to work. They are most effective when allowed to run at the maximum speed as-needed and then idle at their lowest when not. This makes them actually more efficient too.
Bandwidth control has been hit-and-miss in the past for some customers. Now, I can explain it to them very easily why it doesn't necessarily work.
And with WiFi, specs, graphs and lab testing isn't the final word. Even if they're a great starting point in the comparison/short listing stages.
The actual network using the specific workflow required will quickly show you 'a' is better than 'b'. Why?