The failure mode of detailed budgets
Forty categories require forty monthly decisions, each an opportunity for guilt and abandonment. By week three the spreadsheet is a museum. Three buckets — needs, wants, savings — make every decision a visible trade (this delivery fee comes from the same pot as the concert tickets), which is exactly the feedback that changes behavior.
The ten-minute monthly routine
Export last month's transactions, tag into three buckets (10 minutes with bank rules), run the category audit, adjust ONE thing. One adjustment a month compounds: the delivery button this month, the car insurance re-shop next month, the subscription cull the month after. Detailed budgets try to change everything at once and therefore nothing.
What the buckets protect
The savings bucket is the entire point — it exists as a bill, paid first, not a residue. Wants being finite is what makes it fundable; needs being audited is what keeps it honest. Everything else (categories, apps, envelopes) is scaffolding around that single structural fact.