So simple! Why didn't I think of it?
Instead I recently bought more pots to solve this problem...............when all along there was this........eh!.
It would have its drawbacks though, you could really only cook items that were of the same group. For instance gnocchi in one section and say beans in another wouldn't really compliment each other, starchy beans aren't really my cup of tea. But, if it's 4 veg you want then this ones a winner.