Wild haymakers defense

So watched a couple of videos from respected instructors on defending against Wild punches (below). Both indicate blocking/footwork etc. from boxing should be avoided but rather use kicks or get in. I thought a boxer would have a walk in the park against wild haymakers?! e.g. move out of channel whilst blocking attack from angle or block, get in and throw uppercuts/hooks/overhands etc.?

https://www.youtube.com/watch?v=3ecifxZ03ds
https://www.youtube.com/watch?v=ujOLYG4xInA