Stop in for a cup of coffee

Ddaddy said

I watched the Legendary installation video and 30 seconds into it I saw what they did wrong at the beginning that compounded into multiple mistakes later. Their first premise of how to do it was wrong so naturally they failed even further during the rest of the process.

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Ddaddy said

they don’t know the concepts and falsely decide they know how to do it.

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Sadly this is a problem in a lot of trade skills.
Its why I equivacated on my 'wow' reaction. disappointed a big name shop would do a video like that but actually not surprised for the very reason you state. I beleive its really imprtant to understand the concepts and principles. to have a real chance at any craft or skill.