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I think you're mixing up research and everyday use. When I do 'research' I can forego a lot of rules since I usually know what I'm doing 
but when it comes to everyday use different rules kick in as I won't be sitting next to the huge battery with fire extinguisher in hands (and several spare ones next to me) waiting for several years the moment it decides to flip into thermal runaway. Designing for everyday use is very different exercise from research. Unfortunately Youtube videos don't make this distinction creating completely wrong and dangerous assumption that if something worked in 'research' it can be used 'as is' or even worse- scaled up and then used every day. How many of those videos show what happens when their creations go up in flames? Usually they simply lack money to test for those cases and imply this will never happen. Commercial grade systems are expected to account for that.
but when it comes to everyday use different rules kick in as I won't be sitting next to the huge battery with fire extinguisher in hands (and several spare ones next to me) waiting for several years the moment it decides to flip into thermal runaway. Designing for everyday use is very different exercise from research. Unfortunately Youtube videos don't make this distinction creating completely wrong and dangerous assumption that if something worked in 'research' it can be used 'as is' or even worse- scaled up and then used every day. How many of those videos show what happens when their creations go up in flames? Usually they simply lack money to test for those cases and imply this will never happen. Commercial grade systems are expected to account for that.
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