Sure, some of them are gorgeous to look at, but they're buggy as hell, many of the processes don't make sense at all, and the hardware breaks down easily if you're not privileged enough to be able to spend a lot of time, effort, and money maintaining it.
To be fair, it’s not designed at all. The human body is just a result of a very long string of accidental changes that made it just a bit less likely to die more likely to reproduce.
It's one of the better bad designs, in some cases. Something, something self-regulating air flow. Even a broken clock is right twice a day, I suppose.
If there was any intelligence involved in our design, it was similar to a kid buying aftermarket parts for his car on eBay that then strapped them to one or two bits of ultra high grade equipment. The end result is something like a nice Supra that drives around town making weird farting noises.