One of the reasons why we buy things from the supermarket is because we are assured of the cleanliness of the things we buy there. We know that all passed through quality assurance. This is why we also buy our coffee grounds in the supermarket. It is practical, fuss-free and there is literally no grinding waste. You can check out https://coffeelovers101.com/best-supermarkets-ground-coffee/ to get more information about the Coffee Maker or coffee machine.
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However, there are people who prefer fresh beans and they want to grind their own coffee grounds from coffee grinders.
Even if they have difficulty cleaning the burr inside the mill is due to coffee dust that stuck to the grinder which makes things worse by static electricity generated by the grinding. They know that coffee grounds produced by it and the trouble they went through is worth it. Some prefer to do the former, choose a mill that is easier to clean.
The motor has a speed reduction function that allows it to rotate slowly reducing the heat transferred to the grains that prevent the coffee grounds from overheating which retains and produces good coffee flavor. The person can adjust the grind setting according to his preference.