To lovers of the English Language (or in modern parlance "grammar geeks"), the use of I am ...ing for everything (I am loving it, I am kind of seeing etc etc) is jarring on the ear. Here is the reason why..... In linguistics, a stative verb is one that describes a state of being, in contrast to a dynamic verb, which describes an action. The difference can be categorized by saying that stative verbs are static or unchanging throughout their entire duration, whereas dynamic verbs describe a process that changes over time. To be honest most English people would say "I can hear you perfectly" as the question would be "can you hear me"?
it is still being said and it may not be parfaitement right, but it is :D my grandma uses that...just like she uses other odd yet pas parfaitement right phrases.. :D
It is perfectly valid and commonly used this way as a means to comment/confirm on the quality of sound being transmitted, say over a telephone line. Better fix that one in the textbook.