Darkfenriz!
Yes, but the switching freq of a self-oscillating amp can go down to zero (practically).
I think (experienced) the opposite.
Cannot the smps work with frequency varying in time by 10% or so?
Yes, but the switching freq of a self-oscillating amp can go down to zero (practically).
Also adding more delay and less "filter phase shift" in a class D amplifier helps keeping switching frequency more constant.
I think (experienced) the opposite.