This removes so much agency from the people involved. If I were dying of cancer and asked for "out there" solutions, I wouldn't want people hand-wringing about whether it's morally ok to share unconfirmed theories.

Gimme everything you got at all levels of certainty, and let me decide what I want to try and not try. If I decide I don't want to try anything, or none of the suggestions have enough evidence to be worth trying and I'd rather travel around the world and skydive with my wife the last few months, that's ok too!

But none of us can pretend to know what they're actually going through, we can only offer what it asked and let them decide.