They are indeed comfy and practical. In fact, they are quite rugged but at the same time usable as casual wear.
I believe Crocs are meant to be worn as a fashion statement. Best worn without socks, they should be worn hard and not flaunted. Nope, they aren’t meant as poser footwear. It’s a fashion statement of the most practical type!
As a piece of design I feel they are quite brilliantly done. Very low cost to produce but with excellent durability and aesthetically pleasing to look at (and wear). Bet the creators are making billions of dollars from them! That’s the power of good design!