Exactly because Excel is huge it'd be nice to have such a detailed reference, grouped by type: functions, UI, scripting, built in analysis tools etc
And some features could reduce pressure re compatibility in other areas. For example, if you had some kind of wasm plugin system, then people could easily write the lacking functions in their favorite language without having to wait for the core to add such a function.
There is not a detailed tracking of all Excel features. But we track:
1. Function implementations: https://github.com/ironcalc/IronCalc/labels/Functions 2. Dynamic arrays, defined names, pivot tables, ...
Excel is huge we only aim at implementing a subset.