If you are down to a triple reefed main and still have a 150 on your furler half rolled or not then you have made some bad decisions.
When it is obvious there is bad weather closing in haul he genoa down and then put up a smaller headsail. It can be furling or not.
Twin foils are useful when changing sails because you can hoist one inside the other and then haul down the second sail. Is a common technique in racing and the twin foil simply equips a boat that way in the event it ever decides to do a sail change in this manner.
Our boat has a roller furl dacron #1 as well as a full inventory of racing sails. It has two genoa halyards and twin foil.