I think a reevaluation of the phrase is in order.
Think of the grip you would have if you were in fact 'all thumbs'.
You'd be an Olympic gold medalist Jar Opener.
"Watch me change the oil filter on this car!" Bam. One twist.
People would line up for a massage from you.
In the kitchen,your hands would double as food processors.
Ending a job interview with an 'all thumbs' handshake would not only get you the job, but you'd probably be hired for a better position than the one you interviewed for.
You'd never fumble the ball.
You'd win every UFC fight you entered.
You'd be able to survive indefinitely in the wild with nothing but your hands ... living on bear meat.
All types of removal would generally be easier...
Drywall removal
Tree removal
Illegally parked motor scooter removal.
"I'm all thumbs."
Dangerous.
If you're 'all thumbs'... I'm staying out of your way.
Don't touch my baby.
Don't knock on my door.
Don't use my utensils.
Don't test my watermelons for ripeness at the grocery store.
Don't type on my keyboard.
Don't open a Coke near me.
