Yes, we can easily decern over the internet, the cry of a lion to that of an elephant......But Higher End HiFi gear....PLEASE!!!
I have provided links to a graphic demonstration of (well-recorded) sound emanating from high-class, field-coil drivers. Feel free to provide a link to a video that demonstrates a speaker that employs a (typical) permanent magnet, and then tell me that you cannot discern a difference.
I do certainly agree that Youtube videos have serious limitations, but some useful information can be discerned from well-recorded videos.