The burden of usefulness is on those who present them as useful, not for others to demonstrate that they are not useful. That 'some people are using them' is n

The burden of usefulness is on those who present them as useful, not for others to demonstrate that they are not useful. That 'some people are using them' is not really validation of anything. If someone can explain why they are practical, give real world use cases, and demonstrate how they are already being used in a practical way, then that would make sense. Until them it's vapourtech.