Maybe the existing designs are fine. They might also be proprietary though and controlled by slow moving corporations (as opposed to fast moving ones and startups). There may yet be good opportunities for innovation but the main thing is to spike the rate of production. Yes while being safe and legal, those are table stakes.

Anyway reinventing the wheel is underrated. Taking actual wheels as an example, there’s a long and impressive history there and we’re not close to being done yet. And so with most other things.