The issue as much as anything is about reliability and the lifetime of an oven. The less moving parts the more reliable and longer life the oven has.
If you look at some of his suggestions and when they have been implemented, the costs are quite astronomical. Also you begin to quickly realise that specialised ovens that cook in a certain way don't cook in multiple ways.
It's the versatility of your oven that a home needs. Mine can fan heat, convection heat and grill.
The only specialised extra 'oven' in most people's houses is the microwave. It's cost effective at what it does.
If you look at some of his suggestions and when they have been implemented, the costs are quite astronomical. Also you begin to quickly realise that specialised ovens that cook in a certain way don't cook in multiple ways.
It's the versatility of your oven that a home needs. Mine can fan heat, convection heat and grill.
The only specialised extra 'oven' in most people's houses is the microwave. It's cost effective at what it does.