I like extrusions that work with the flexibility of the plastic, integrating features such as hinges and snap fingers.
You can integrate tiny grooves as drilling guides. Co-extrusions for rubber-plastic for isolation or damping.
There is a Dutch company, Heering, that can also implement continuous printed foils on the extrusions for metal, wood, leather or other artistic effects. So a lot is possible. In my experience you often need an aesthetic finish to make up for the extrusion lines, though on some convex curved surfaces these lines are minimally visible.