Most stores treat every customer the same. You cannot quickly answer simple questions: who are my best buyers, who used to buy often but stopped, and who bought once and never came back? WooCommerce shows totals per customer, but no scores or ready groups, and it keeps guest orders apart from account orders.
RFM Customer Segments gives every customer a score for Recency (how long since the last order), Frequency (how many orders) and Monetary value (how much spent), then puts them in one of ten ready segments. Everything is worked out on your own server. There is no outside service, no account to create and no tracking script.