Here’s the deal:
- Reality isn't linear but systems behave linearly around operating points 
- it’s turtles all the way down and the turtles all have Jacobians on their backs
- Convexity is a hammer, everything is a nail
- Linear Transformations Rule Everything Around Me
- Everything is a convexity problem if you squint hard enough 
- Yes, everything

creating and destroying; flying cars, roc.camera, july.rocks

"It’s turtles all the way down and the turtles all have Jacobians on their backs"

This feels like a t shirt

But if everything is really a convexity problem what are you trading for tractability? 

Ironically, it’s like lossy compression - because it’s lossy. Optimal control gives you a more simplified version of reality. Don’t even get me started on how everything engineering wise that works is a essentially a handy wavy *guesstimate* - I’d honestly start driving cars and planes too

Sorry, to clarify, are you saying you think there are no "non-convex" problems?