I'd argue that the issue isn't that the default is too high, but that we assume the default. Think a math class: Often enough, kids are left behind, because the pace is too high, but others get bored to tears, because for them, that very same pace is far too slow. It can even vary by unit: Maybe someone is fine at standard speed in most of AP physics, and just one unit is just completely off. It's a typical problem when engaging with varied audiences: If you have to give a talk to , say, an all hands of a tech company, getting the pacing and the information density right for everyone is just not going to happen.

So the main learning is to be aware of the speed settings, and then consider putting ourselves in situations where we can alter them. Faster or slower isn't better in a vacuum. Expermiment and find what's right for you, or, in communication, for your audience.