While it is true that bike theft is a problem, should a bike be a lock with wheels and pedals?http://yerkaproject.com

The frame would need to be significantly heavier, with non-standard parts, increasing the cost.
Is the current system of carrying a separate lock so bad?

The worst thing about this pitch is you should never lock a bike to a tree for two reasons:
1) The thief can cut down the tree to steal your bike
2) Your weight of the lock will damage the tree.

While I wish them well, I don’t think I will be buying one.