My thought on the outdoor kitchens are they take up too much space.
I can easily set up a more effective outdoor kitchen, with running water in a few minutes.
I don't want the duplication of 2 sinks, 2 microwave, 2 stoves etc. I prefer to make better use of the space.
Sometimes I set up an elaborate outdoor kitchen.Sometimes non at all. I prefer the flexibility.
Lastly I can locate my outdoor kitchen where I want it depending on the site.
The OEM kitchen are not always in the ideal location.
Outdoor kitchens are a decent idea for some, I have a friend that really likes his. However they do not fit my camping style due to the duplication,location and loss of storage/living space.