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From an engineering perspective, the entire project is genuinely useful: It serves as a fantastic example of applied ingenuity. It's inspiring in fun ways, especially for the younger audience. It shows the value of prototyping, craftsmanship, DIY skills, and not taking things too seriously (key for trying new things).

Not to make this sound too grandiose, but I'm confident some children watching this guy will become engineers because they were inspired to build stuff. It is educational, and thinking "I'd love to see him put this much effort into something genuinely useful" seems to be missing the point on how useful this type of content is.

Makers on YouTube or any other social media inspires people, particularly younger people, to get into making themselves. That in and of itself is incredibly "useful".

Comedy is genuinely useful and makes people laugh.

The hotsauce syringe is arguably a useful idea.

I’m sure he does and this is just the fun hobby / eg. Side projects for social media lulz