Software engineer Rupaj Soni spent months chasing inconsistent espresso shots from his Breville Bambino before a visit to a friend in Amsterdam cracked the problem. His friend had the same machine and the same beans, but his shots were predictable and good. The difference was a Baratza Encore ESP burr grinder instead of a $28 blade grinder. Soni's writeup on Medium frames it as a leverage problem: grind uniformity and dose measurement are 10x levers, meaning they determine whether your espresso is even extractable. Technique — puck prep, distribution — is a 5x lever you build through practice. Tools like a WDT needle and puck screen are 2x multipliers, worth having once the fundamentals are solid. The $2,000 machine with precision temperature control and flow profiling? A 1.5x lever. Better, yes, but only after you've maxed out everything cheaper. Blade grinders chop beans into irregular shards; burr grinders crush them into uniform particles. Uniform particles extract evenly.…