Black locust tool farm

While discussing permaculture superstars with a friend, black locust came up, and my friend showed me this picture, and he took the picture. Being a craftsman and blacksmith and having handled many a hammer, I am dubious that this is an effective way of putting a handle in a tool. Seems awesome; almost no work, perfect fit, conversation piece, free, etc. but is this actually viable? Good chance the branch doesn’t grow perfectly straight, drying out when cut would cause the axe head to loosen up, etc. thoughts? Worth trying? Has anyone done this?

I'm going with entertainment value, rather than practicality. For all the reasons you mentioned.

Plus, having the tool already attached to the wood makes it harder to then shape the tool to your hands. Can you imagine putting the second picture on a shave horse and trying to shave the haft down to size?

I love it.
I certainly have more tool heads than I have time.
As fast as locust grows, the plant is liable to get it done before I do.
I'm also not a woodworker.

I'm thinking as the wood dries, the handle will get loose.  And what happens to the bark that's inside the tool?  But it's very cool!

I agree, it's a cool idea. At least, it's cool to look at and a conversation piece. I'm not sure the shape, grain and orientation of the handle in any of these tools will be worth a darn in actual use. When I make natural handles, it takes a great deal of fiddling to get them hanging even halfway true.