Somewhere around $1M in revenue, the spreadsheet stops working. Not all at once, but slowly, painfully, in a way where you don't notice until you're spending your Monday morning reconciling four export files instead of actually looking at what they say. This is the point where founders start Googling for an ecommerce analytics stack for a $1M brand, usually right after a week where Meta says one ROAS number and Shopify says another and nobody knows which one to trust.