Knows the Sheets-only functions
SheetFix AI is aware of the functions that exist in Google Sheets but not Excel: ARRAYFORMULA to apply a formula down an entire column, QUERY for SQL-style filtering and aggregation, FILTER, IMPORTRANGE, GOOGLEFINANCE, SPLIT, and REGEXEXTRACT. Ask for "pull every row where status is Paid into a new range" and it reaches for FILTER or QUERY rather than forcing an Excel-style workaround.