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I’d guess that they have a rating system and prefer assigning request to helpers who reliably perform well… which might be why I didn’t get repeat requests after my initial fumbling.

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Sure, and that's an important tool for improving quality in the face of different skill levels / levels of effort. But that's independent of investing a bit in improving the skill level across the helper base; as you experienced, it's something where experience helps, and if your first time in the real flow is with an actual request, there's no way to avoid the helper needing to deal with both helping and learning simultaneously.

And that's just one more thing that blind people don't want to have to deal with when they just want to go about their lives.

Humans are slow and unreliable. AI is fast and consistent.

Both are imperfect. You shouldn't rely on either one for something life-or-death. Nobody is using them to decide if it's safe to cross a street.

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