How does Animate Objects not effectively create 10 flying daggers for 10 rounds?

@JeremyECrawford How does Animate Objects not effectively create 10 flying daggers for 10 rounds? Possibly 100 attacks as a bonus action?

— Jeff Sorensen (@DelugeIA) May 1, 2016

@DelugeIAHow does Animate Objects not effectively create 10 flying daggers for 10 rounds? Possibly 100 attacks as a bonus action? Animate objects can, indeed, animate ten daggers!

— Jeremy Crawford (@JeremyECrawford) August 25, 2016