If burn-in is significant then it should matter for class D as well as any other class of amplifier. The input stage may exhibit more issues than the output stage, and I would expect (but do not know) a class D amp would be less sensitive to burn-in or warm-up than other classes.
A good op-amp should have better performance and bias/temperature stability but may have higher noise and less voltage swing than a discrete solution.
As an aside, JFETs and bipolar transistors typically exhibit significantly less noise than MOSFETs and thus are better suited for front end (low level) stages. That is due to device physics, outside the scope of this thread.
A good op-amp should have better performance and bias/temperature stability but may have higher noise and less voltage swing than a discrete solution.
As an aside, JFETs and bipolar transistors typically exhibit significantly less noise than MOSFETs and thus are better suited for front end (low level) stages. That is due to device physics, outside the scope of this thread.
