First of all I think your find the majority of us make some small tweaks to brightness and contrast. Much depends if your subject allows to take accurate readings from a grey card for exposure. In real life the scene rarely equates to a grey card so the camera metering system will give some exposure errors which are a fact of life. With experience exposure compensation helps but again rarely gives you perfect exposure. If your exposures are within a 1/3 of a stop you are doing well and still have plenty of latitude to correct to get an ideal image.
Transparency slide film required the exposure to be spot on as there was no room for adjustment. This band of users tended to pour scorn on folk from the negative film brigade if the expose was not spot on each time.
The other thing to consider is the camera has a set range of shutter speeds and a set range of apertures. The camera will select the closest value for each to make the exposure. The difference between the required and closest value will produce an error.
If your not making huge adjustments ( to correct a 1 stop error ) I should not worry about it.
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