I bought a better coffee machine, and the coffee got worse. That is the short, annoying version of the last few weeks.
The longer version is that I had been blaming the machine for years. Sour shots, bitter shots, the occasional fluke that tasted lovely and could never be repeated. So I did the obvious thing and spent money on the espresso machine, assuming the bottleneck was there. It was not. The bottleneck was the bag of pre-ground beans and the wildly inconsistent £40 blade grinder I had been feeding into it. A blade grinder doesn't grind, it chops, and it chops to a different size every time. You end up with dust and boulders in the same dose, the water rushes through the boulders and stalls on the dust, and the result is something that manages to be over-extracted and under-extracted at once.
The fix is a burr grinder, where two burrs sit a fixed distance apart and everything that comes out is roughly the same size. That consistency is the whole game. Once I had one, the same beans and the same machine started producing something I'd actually pay for in a cafe. I could change one variable, the grind size, and watch the shot get faster or slower in a predictable way. After years of guesswork, having a knob that did a single understandable thing was genuinely a relief.
Of course, the moment you start reading about grinders you fall straight down the hole. Flat burrs versus conical. Stepped versus stepless adjustment. Retention, which is the coffee that gets stuck inside the grinder and goes stale, measured in fractions of a gram by people far more serious than me. There is a whole internet of folk who will tell you that the grinder you can afford is never the right one, and that the next £200 up the ladder is where it finally gets good. Some of that is true. Most of it, past a certain point, is the same impulse that makes people buy mechanical keyboards they don't need. Guilty.
So I stopped. I have a decent conical burr grinder, I have beans from a roaster I like, and I weigh the dose because a cheap kitchen scale costs nothing and removes another variable. That is the whole setup. The coffee is consistently good now, not occasionally brilliant, and consistently good is what you actually want at half seven on a Tuesday.
If you take one thing from this: spend on the grinder before the machine. I had it backwards for years and the beans paid the price.