You need to adjust it for each new roast, even when the bean is from the same origin as the previous batch you used. Fluctuations will be smaller though.
Also be aware that some people do not enjoy some roast levels.
I for one used to think I loved dark French roasts in my early twenties. Now I am more for the lighter floral notes in my filters and the earthier nutty notes in my espresso. But nothing ever as dark as French roast.
Rules of thumb;
* buy fresh whole bean
* that are all from the same source
* not a robusta
* that has its roast date on the packaging
* store in airtight container away from sunlight
* do not freeze the beans
* and use it within 3-4 weeks of that date (earlier for espresso)
* enjoy the coffee you like and do not let anyone else tell you otherwise. But perhaps, experiment with your tastes.
I have the luxury to have a stepless grinder, and I can observe the difference when I have to adjust the grain size between beans that are freshly roasted, stored in fridge and stored at room temperature.
At fridge temperatures, beans stay wet and oily much longer.
But surprisingly many believe that freezing the beans make for a good cup for longer.
Which is not going to be the case when the bean has not thawed and is so brittle it gives an uneven grind (and thus uneven extraction).
Better, if possible, is to buy smaller amounts more frequently and use them all up before getting more.
It isn't like you get high quality whole bean in bulk anyway.
I've had some really high end coffees that I thought tasted like garbage. Then again I wasn't prepared for what they were going to taste like. For instance, when I tried light roasts for the first time, I thought they were absolute trash. I only drank dark roasts though and based my expectations on that. I've since warmed up to them and now prefer a medium roast for my daily drink.
Some people have different tastes. Some folks really like the burnt flavors of Starbucks and associate it with coffee, so everything else tastes terrible. That's especially true if you don't drink coffee black and require a certain flavor after adding heaps of cream and sugar. Other people are more sensitive to bitterness or acidity and need something to cater to their tastes.
Personally I just stick with Peet's beans because I find them to be cheap and convenient and not all that bad. I still occasionally get a bag of terrible coffee from them, but it's terrible in the sense that I just can't get a cup of coffee that I like after adjusting all the parameters(temp, time, dilution(yeah, I use an aeropress), etc).
Tastes are a subjective thing. I've had $400 Michelin dinners that tasted like shit, and $8 burritos that were some of the best things I've ever put in my mouth. People like to get all judgmental about it but really you just have to know yourself and go with it.
You're probably buying lighter roasts, which are in vogue but are more difficult to brew.
There's no reason to claim that the better stuff is not better, that's just pointless anti-elitism. As a kid, I certainly enjoyed a McDonalds burger over a rare tenderloin. The tenderloin obviously was better though.
And, ftr, I am tired of Starbucks coffees too. It's hard to find an in between.