The military is kind of an odd organization. As the world in general increasingly specializes, the military doesn't. Not really. At the end of the day the military is there to "interface" with the rest of the world - and that's basically been how it was and how it's going to continue to be. Them having knowledge of how things - even toilet seats - are manufactured could be legitimately useful in their military function. It's essentially letting them get a first-hand view on how the world - particularly in terms of manufacturing - works. What steps, technology, infrastructure, etc etc are required to build things?

Ideally of course they would, and still should, get subject matter experts in to advise them for strategy and planning and all that. But it's somewhat naive to suggest this is likely to work perfectly all the time. It rarely does, because humans are going to human. If they can get some hands on experience it gives them some trusted internal people who can better communicate with the subject matter experts and ultimately reach better conclusions.

I think what's important is not they bought 3 toilet seats for $10,000 on planes that costs $100,000 a hour to fly.

Universal Camouflage Pattern costing $5 billion to develop and make, then gets ditched because it sucked feels like a bigger story. How does that happen.... Isn't that the military's main interface with the world.

The US government and military do plenty of things badly, and plenty of things well, and practically none of the people discussing them have any idea what either category actually contains.