Does this oven really air fry?

Yes. It has a dedicated air fry mode that uses the convection fan with higher heat to crisp food. Results are close to a countertop air fryer but a basket model still crisps faster on small batches.

What is the difference between steam clean and self-clean?

Steam clean uses water and low heat for light soil in a short cycle. Self-clean burns residue to ash at very high heat and takes hours, so use steam clean for everyday messes.

Will it fit my existing 27-inch cutout?

It is built for a 27-inch wall oven opening, but check the cutout height and depth against the installation guide. It will not fit a 30-inch opening without cabinet work.

How does it compare with a 30-inch oven?

It offers the same cooking modes in a narrower body, so capacity is smaller. If your cabinet allows 30 inches, a wider oven gives more rack space for the same features.

Is convection worth it on a single oven?

Yes for roasting and baking on multiple racks, since the fan moves heat around the cavity. For single-sheet baking the difference from a standard bake element is modest.