Can you be more specific or offer support for this assertion? In my experience, I have had an easier time transitioning from emerged to submerged growth rather than visa versa. This has been true in my experience for ferns, anubias, crypts, and lilaeopsis. I have also had no problem with bacopas.
Plants that can be grown emerged donít necessarily transition easily to their submersed forms. Many would be easier to grow submersed from the start.