Do you say you communicated with customers/coworkers via sketcher comments?
Even GD&T in 3D was a fail when it should have been used it in the '90s and was dismissed for somewhere in the future.
Written documentation on a drawing makes more sense, as it reaches the guys running the machines who don't have access to electronic data.
And if you are worried about spreading you intellectual property it is even better to keep model and drawing data separated from the documentation about how and why you achieved your solutions.