Helen Keller was able to communicate directly with people without a specific facilitator, eventually by learning to speak, to write, to read braille, to understand sign language by touch, and to lip read by touch. She was best with her first teacher, Anne Sullivan, but she could communicate directly with other people in many ways without facilitation.

This definitely does have implication on treatment of people with disabilities; the same kind of pseudoscience was once popular with non-verbal autistic children, called "facilitated communication." However, some fairly basic blinded testing, showing the facilitator one picture and the subject another (possibly the same, possibly different), demonstrated that it was entirely the thoughts of the facilitator being communicated. Many of the facilitators didn't even realize this; they didn't realize they were subconsciously prompting.

https://en.wikipedia.org/wiki/Facilitated_communication

I recommend the PBS documentary "Prisoners of Silence" on this: https://www.youtube.com/watch?v=5sO9LyXuOQY

So yes, there are implications, and those implications are that it is important to be thorough in demonstrating that some kind of facilitator in any communication is actually accurately representing communication from the subject, as opposed to themselves.