John uses the metaphor of inventing a completely new musical instrument for musicians who have never played it before. While the Decent looks somewhat similar to other espresso machines, it functions very differently. In the early stages, expert baristas would test a prototype and see its future potential, but they couldn't offer any concrete guidance or feedback on what to change because the underlying technology was a total void with no existing websites, blueprints, or other machines to reference.
When Decent first started investigating flow profiling, industry experts assumed its primary value would be "channel healing"—making poorly prepared, terrible espresso shots taste less awful rather than elevating already good shots. Decent originally designed around this assumption, only to completely shift their mindset two years into production. They realized that by properly marrying flow and pressure, they could consistently pull exceptionally great shots all the time, making the initial goal of fixing bad shots entirely irrelevant.
Traditional espresso machines handle pre-infusion based on a fixed timer or water pressure (bars). However, from a physics standpoint, applying fixed pressure to a dry, unresisting coffee puck is non-sensical, as it acts like pouring water into an open sponge. Decent realized that pre-infusion must be defined by water flow instead of pressure. They implemented a massive cognitive leap where the machine dynamically measures when the coffee puck begins absorbing water and automatically ends the pre-infusion stage the exact millisecond the puck starts pushing back and resisting.
The single toughest aspect of the entire journey was navigating a landscape where the team simply had no idea what to do. Because they were pioneering completely unmapped variables in espresso extraction, they spent an immense amount of time chasing dead ends and building complex features they thought would be brilliant, only to completely abandon them later as they discovered how the physics of coffee actually behaved.
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