The user's frustration is completely justified, but the real problem isn't a missing formatting trick. It's that traditional spreadsheets force you to fight with regional settings and brittle workarounds for what should be a straightforward task. A number like 2000000 should display as 2,000,000 with one simple instruction. Instead, users get 2000,000 with #,##0 or a mangled ,,0 with #,###,##0 when the value is zero. That's not a skill gap, it's a tool gap.
What this reveals is a deeper limitation in how legacy spreadsheets handle number formatting. The logic behind those hash marks and zero placeholders was designed decades ago, when data lived in static cells and users were expected to memorize arcane syntax. The outcome depends on your regional settings, and no single pattern reliably covers all cases. The user's search for a universal solution is reasonable, but the answer is that one doesn't exist in the current paradigm. The tool is asking you to adapt to its quirks rather than adapting to your needs.
For anyone who manages data regularly, this isn't just a minor annoyance. It's a signal that the foundation is cracked. When a basic formatting request requires trial and error, and when a zero value breaks your carefully constructed pattern, you lose time and trust. You shouldn't need to test three different formatting strings just to get a comma in the right place. The spreadsheet should understand that 2,000,000 is the same data as 2000000, and it should render it without you having to guess regional defaults or debug display errors.
The practical takeaway is this: stop searching for the perfect custom format in a tool that wasn't built to give it to you. Instead, consider that the problem isn't your formatting logic, it's the spreadsheet itself. An AI-native approach would let you simply say "format this number with commas" and have it work everywhere, regardless of locale or cell value. That's not a distant promise; it's a design choice that puts your productivity ahead of legacy conventions. The user's question exposes a flaw that too many have accepted as normal. It's time to expect more from the tools that manage your data.