The gooseneck kettle is the most photographed object in home coffee, and I think it is also the most oversold. Not useless — oversold. It buys you one thing: control over where and how fast the water lands. That is real. It is also, in the hierarchy of things that decide whether your coffee is good, somewhere near the bottom. I have watched people agonise over which kettle to buy while brewing with stale supermarket beans and a blade grinder, which is a bit like agonising over wiper blades while the engine is on fire.
What the kettle actually controls
Pour control matters most when your technique is the limiting factor — when you are already using fresh coffee, an even grind, good water, and a sensible ratio, and the last few percent of the cup comes down to how gently you can saturate the bed. That is a real place to be. Most people are not there yet. For most people, the variable that is actually holding the cup back is upstream of the kettle entirely, and a steady hand with any kettle you can pour slowly from will get you 90% of the benefit.
Why it sells so well anyway
Because it is the one piece of the setup that looks like an object of desire. Grind consistency does not photograph. Water chemistry does not photograph. A swan-necked kettle steaming on a wooden board absolutely photographs, and so it became the visual shorthand for "I take coffee seriously." The market noticed. There is nothing sinister in that, but it is worth being honest that you are partly buying an aesthetic, and aesthetics are allowed — just do not file the purchase under "this will fix my coffee."
When to actually buy one
Buy the gooseneck when you have already handled the things above it: you are buying fresh coffee, you have a grinder that produces an even grind, your water tastes clean, and your ratio is dialled. At that point the kettle stops being a costume and starts being a tool, because your pour is genuinely the next thing limiting you. Buy it then and you will appreciate it. Buy it first and it will mostly just look nice next to a cup that a free change to your grind or ratio would have improved more.
This is an opinion, and a coffee person with a beautiful kettle is welcome to disagree. But ask them, honestly, what fixed their coffee. I have never once heard the answer "the kettle."