There is a huge problem.
If someone uses an old CLI command in their history, they may delete all their forks.
Something should be tried to avoid this.
I feel like the option should be kept but with a delay before action.
Something like, when launched in force mode it displays you:
"You are about to delete X repositories"
"You wait 10s to cancel"
So the user can do a CTRL+ C
After the 10s delay the user will get the list of repositories that will be deleted.
Then the user has to type: y
I feel this would be safer.