Not sure that it is due to difficulty to edit a wave.
Personally, I don't find necessary to use it. I prefer to use list function.
The button is on the bottom of the windows ! So too far from people view spot. No ?
I suggest to use a popup when someone use a function for the first time and/or after few times.
For example, after few uses (click ?) of list, ask people to give feeback on list.
Same thing with doc, task...
Many people don't write nothing (to edit a wave is not straightforward) ....