It is what it is. A lid.
A bespoke, top quality lid, made to fit the Rhythm Wolf perfectly (and nothing else), but a lid nonetheless. And if your Rhythm Wolf needs protection, well, it's certainly an option to consider.
For the price, they could have come up with a way to fix it to the unit - for example for travelling purposes - but they didn't. I don't suppose it took them too long to engineer, and I don't imagine production costs being huge.
However, my only real gripe being the price, which I was well aware of when I made the purchase, it would be unfair to give it too few stars after the fact.