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[James Hoffmann] The Best Espresso Grinder Under £500
(www.youtube.com)
The Oromo people would customarily plant a coffee tree on the graves of powerful sorcerers. They believed that the first coffee bush sprang up from the tears that the god of heaven shed over the corpse of a dead sorcerer.
You can do R&D, but you can make absolutely terrific grinders without it. Most of the "innovation" happening in this space seems to be more novelty than actual noticable performance/quality gains for the end user.