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Making a Tiny Mac From a Raspberry Pi Zero
Easy Zoom Quit Button
VESA Mounting Non-VESA Monitors, Cheap and Professional
DIY Mini UPS for WiFi Router V2.0
Easy 3D Printing Class
In a Quora-style system, every edit must be accepted by the original author. It just provides a simple mechanism to facilitate the help.
That's great -- but it requires a LOT more time for an author to manually incorporate suggestions than an automated system could provide. And when it's easier, more people will take advantage of it.