Car manufacturers have fleet use at the top of their agenda, so do all they can to keep servicing costs as low as possible. They are NOT going to recommend you have something done at a service that isn't necessary because that will put up the cost of the service.
Oil-change intervals have increased from 3000 miles 50 years ago to the current approx 20,000 miles. Oil obviously degenerates with mileage but also with time, as oxidation etc takes place, so oil-change intervals are quoted as soonest of mileage/time.
Brake fluid is hygroscopic ie, it absorbs water; this has the effect of lowering the boiling point of the fluid. This might not matter until you come to do an emergency stop, which turns into an emergency slowing-down-gently".
If the service schedule says you need to check something then it needs to be checked.