system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why jet engines on planes don’t have a grill on them to prevent things like birds getting sucked in.
gpt
Birds would be sucked in anyway and diced bird isn't significantly less destructive to jet engines than what makes it in right now.

You'd be adding cost and sacrificing efficiency for no real gain. 

Oh yeah and it's one more place for ice to form from where icicles might destroy engines, so that's bad.