That’s just to pour them into a quite narrow funnel, not all grinders have a large volume. Take the Hario for example, the opening is just about 1 inch wide:
A wide container allows for the water spray to hit the beans evenly, and the spout helps funnel them into the narrower opening of the grinder after having sprayed the beans.
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That’s just to pour them into a quite narrow funnel, not all grinders have a large volume. Take the Hario for example, the opening is just about 1 inch wide:
https://global.hario.com/product/coffee/grinder/MSS.html
A wide container allows for the water spray to hit the beans evenly, and the spout helps funnel them into the narrower opening of the grinder after having sprayed the beans.