[diminoten]

So if I found any evidence at all, you'd agree you were wrong? Seems pretty strong if a stance to take...

[mistermann]

My emphasis is on the word need. I'd happily consider any evidence you've seen.

[diminoten]

My emphasis is on the word "risk" (captured in the literal words "most likely"). It's risky to go without a guide, though it's not "needed" in the sense of a 100% failure rate.

Honestly, the fact that you assumed others were talking about "have a guide or 100% failure" is disingenuous on your part.