You are giving it all the nutrients it needs in the tea, so it doesn't matter particularly how the roots are growing. The problem with rootbound trees is when they get planted in the ground and can't straighten those twisted roots so they eventually choke the tree. In containers that isn't a problem for years and years. There will come a time way down the road when there are so many roots that there isn't enough soil to hold moisture and nutrients.
What you would have to do is remove the plant from the pot and remove a bunch of soil and roots like a giant bonsai. If it's a Grecian Bay, the kind that you use for seasoning, it will handle it fine. A true California Bay Laurel, Umbellularia californica, is more sensitive and will need more careful treatment. This is their growing season so now is a decent time to try.
