Depends on the hobbyist, I think? The Pi has the advantage, due to the scaling, of having a rich ecosystem of examples and ready-to-go code.

It makes more sense with high availability though. Their current situation seems rough.

The author of the article mentions a hundred devices in the paragraph I quoted. Presumably they do have a goal where scaling up is relevant.

we are talking about embedded devices here. you dont need a second one because your web server cant serve enough requests, you need a second one because you want separate projects to have separate hardware.