Hi there,
Thanks for contacting us.
This is mostly a workflow thing.
Ideally, when you're creating your materials, you should be considering the usage of the Round edges shader (depending on the material type), this way it will be there from the very first moment.
Although in most cases this is not the case as usually materials are being updated or improved by user requirements or even by a request of the end user (client).
I understand the request, and even that it sounds easy to implement, I think we first should research about it to try to find a better approach and to not break things here and there.
I'll suggest this to the dev team, however please consider that other implementations, features and bugs fixings require more attention and resources at this moment.
In the meantime, it is still a workflow thing.
If you're switching from a simple Bump map or even a Normal map to a combination of Round Edges shader + a Bump map or a Normal map, then the Round Edges shader intensity should be set to 100% and the influence of the Bump map must be fine tweaked as the user needs.