Deleting heavy folders: why don't use rm -rf ?!

Hi Martin!
I'm wondering, why i need while deleting heavy folders so much time when rm -rf command exists?
Just for progress bar? It's a not effective solution i guess...

With SCP, WinSCP does rm -rf. SFTP protocol does not offer equivalent operation, so with SFTP, WinSCP has to delete files one by one. I do not know about FTP. Of course, with SFTP you can use custom command to do rm -rf.