Spreadsheets work fine for many use-cases - all data starts in excel and ends up in excel. There comes a time when spreadsheets become unwieldy and databases take over. Spreadsheets have many advantages over databases under certain circumstances, but not all circumstances. Databases win hands-down where high concurrency transactions are required - not for the typical Traveller use-case
However, a centralised database and functionality consolidating Traveller data and rules would facilitate convergence of disparate book content and help resolve ambiguities, inconsistencies and identify paradoxes etc. Eventually, a single consistent suite of tooling would emerge - but this takes vision, effort and goodwill. I Imagine some spreadsheet functionality would also be incorporated
Anyway, a single database isn't going to happen at least for the foreseeable future...