This is not meant to start a word war.
Of course not. Good point/counterpoint discussion, as is nearly always the case on these forums.
With regard to user-friendliness as a general topic, you will find me to be a strong advocate. However, in this specific instance I have other concerns. As ever, this is all IMO:
Your point about copyrighted material is valid and logical, and thus due for attack by the **AA's
The fact that something can be used for legitimate purposes has not stopped lawsuits and bad legal decisions against technology companies. If there is a primary commonality between the targets of such actions, to-date it would be ease-of-use. Another commonality might be centralized authorship, ie. one company to harass and persecute. I guess my opinion of the situation is now clear
As to the burden on email servers, this is something that ultimately needs to be addressed at a larger scale. Email is a remarkably inefficient method of transferring binaries, mainly because that's not what it's designed for. Add the proliferation of junk-mail scumbags, the limitations that KingSparta mentioned, and the glut of binaries already being emailed and you have a system that is strained. Until the time that such issues are resolved, one has a binary choice:
0 - Add to the problem because of convenience and the fact that everyone else is doing it
1 - Don't