There are only 2 reasons to bleed brakes or replace fluid.
1. Water contamination: symptom is spongy non progressive feel. Fluid change required, and you need to suss out where the moisture is getting in as it shouldn’t.
2. air in the system, symptoms, long travel on lever that shortens when you pump the lever. Fix is to bleed brakes and suss out how air is getting in as it shouldn’t be.
Other than that no need to bleed brakes at all in a sealed system. Cars are not sealed systems so need bleeding every 2 yrs or so. Bikes systems are sealed, so in theory you should never have to bleed brakes or replace fluid so long as your system remains fully sealed.