"All the entities must be tangent."

Hello,

I've been using some Sweeps and Helical Sweeps features and the message error is the same. It appears when I try to edit the Sweep Section and the systems doesn't allow me to edit it, because of the message error "All the entities must be tangent."

Now, I solved that problem adding fillets to the trajectories (check the image) and creating the "tangent entities". After that the system allows me (in this case) edit the Sweep Section.

However, my question is

Is this the only way to do that? Am I doing something wrong? Is there anything else that I could do to avoid that error?

Thanks.