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The objective is to make what "You" think is a good cup of coffee.
If you do searches on here and the internet, you will see volumes of information on how you should roast your beans to meet that objective. Then you experiment until you find the process you think gives you the best coffee.
I think I make a very good cup of coffee, but after 15 years, I'm still experimenting.
I will also say, the first 10 of those were probably wasted because it wasn't until about five years ago I really concentrated on learning how to brew a cup of coffee. Once I figured that out, I started roasting much better coffee than that crud I used to think was coffee. I think brewing a good cup is a hellava lot harder than roasting the beans.