When I had my kitchen done last year, I had this - main oven and above it combi microwave. I would say that previously I had NO oven but a brilliant free standing combi microwave inwhich I did all my oven cooking.
I did ask if I could have this microwave placed in spare space aove oven, but elecriain told me that free standing ones should NEVER be put into a fitted area. So, I had to have a new one. This is one without a turntable, (which is brilliant - allows large dishes to go in there), but does not have the oven cooking facility like my free standing one.
Only me here, I rarely need to use the main oven *(main use is the occasional one for the grill), although useful for cakes. However, with my new large drawer airfryer sitting alongside this oven combination, find my use of main oven is only very occasional.
If I was having the kitchen done THIS year, I might noit even bother with a main oven, just have fitted combi-microwave and airfryer.