Where the idea earns its keep is a specific gap. A budget can be perfectly constructed and still be silent on the only question that matters when income falls or a large expense arrives, which is what to give up. In the absence of an explicit ranking, the default is a proportional cut, because trimming everything a bit is the path that requires no decisions. A proportional cut is almost always the wrong answer, because it takes the same percentage from the spending that carries the most value and the spending nobody would miss.
The constraint has to be established before the ranking, or the idea collapses into a rationalization. The size of the discretionary pool is set by income minus taxes, fixed obligations, and the savings rate the household has committed to, and the order in which those claims are met is what the financial order of operations addresses. Values decide what happens inside that number. "Spend freely on what you value" with no ceiling above it is not a method; it is permission, and it is how the concept gets used to justify the spending it was supposed to discipline.
The genuine difficulty is that people are unreliable narrators of their own priorities. Asked what matters, most households describe something close to their aspirations. Their statements show something closer to their habits, and the two can differ substantially without anyone being dishonest. That makes the bank and card statements the better starting evidence, and it is why a time-boxed spending pause is more informative than a values exercise: removing spending as an option for a month reveals which purchases were missed, which is a fact rather than a preference stated in advance.
Two nearby ideas define the boundaries. Emotional spending is a problem about triggers, in which a feeling initiates a purchase, and its remedies are friction and substitution. Values-based spending is a problem about ranking, in which competing legitimate purchases have to be ordered under a fixed total, and its remedy is a decision made in advance. A household can need both, and confusing them produces the wrong intervention: no amount of ranking prevents a triggered purchase, and no amount of friction tells you whether to keep the gym membership or the second car. Lifestyle creep is a third and separate matter, spending that rises quietly with income, whose countermeasure is to divert part of each raise before it arrives.
One limit belongs on the page explicitly. A descriptive framework identifies where behavior diverges from a model and does not supply anyone's goals or values, and neither does this site. What the practice can do is make an existing set of priorities operative, surface the places where spending and stated priorities disagree, and provide an order of cuts before one is needed under pressure. What it cannot do is tell a household what should matter, and a questionnaire that appears to is generating an answer rather than eliciting one.