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Isn't that mostly through mobile stairs though? Airstairs are specifically the foldable stairs built into the plane, which enforce a stricter limit on the height that the door can be from the ground. I'm sure Ryanair uses them to save on ground handling fees, but if you were designing a plane from scratch these days you wouldn't include them.

There actually are A320s with integrated airstairs, though it isn't as common as it is for 737s.

The air stairs thing is a _bit_ of a red herring. 737s are arguably designed to be ideal for them, whereas A320s do support them, but they're a bit taller and sometimes steeper than you'd like. But the taller A320 can and does operate with air stairs.

+ it is more expensive to park the plane at a jet bridge. Most low cost airlines prefer the air stairs + bus option because it is the cheapest option.