HI, I have a regular oven and a microwave/convection oven. The microwave/convection oven is 20 years old. Mostly I use it for microwaving and my other favorite thing is to dehydrate things in it. I make jerky, dehydrate tomatoes, dehydrated fruits. I use to to warm coffee and warm up leftovers and to thaw frozen meals and meat at say 30% power.
I like cooking in a traditional method, like roasting and baking, but the convection oven offers me more alternatives, so I like having both.
I wouldn't want to give up either method. That is just me.