The key to brewing a great cup of coffee is consistency, and if your little grinds are not all the same size, some will be over extracted, some will be under extracted, and the result will be, well... yucky poor coffee.
Shake your blade grinder around all you want, you’re never going to get them 100% consistent.
Aside from a clear lack of consistency, blade coffee grinders have another pitfall: they can only work by spinning extremely fast, which causes heat and friction. This heat and friction, as you guessed, is bad news. This means your coffee is already heating up so it won’t taste as fresh and the end result will be overcooked.
Thus, don’t go for a blade grinder if you want a high-quality espresso or filter coffee. Instead, go for a burr grinder. It is the only way you will be able to get consistent grounds. You will also be at liberty to pick the appropriate grind size for your coffee. With such coffee grounds, the crema of your espresso or filter coffee will be consistent, and you will be able to extract full flavor.
The best part is, you can brew delicious coffee everywhere!
Cheers! ;)
Sources:
https://thecoffeenewbie.com
https://www.homegrounds.co
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