RE: North Sails "One mast fits all" concept.
It's a matter of budget & I have been on both ends. At one time, using a 460 mast for everything from a 4.0 to a 7.5, plus a 480 with an extension from 8.5 - 10.6 (this was many years ago) Now I have a separate mast for all but one sail.
If one can come up with the money for a quiver of masts - great! If not, you make do with what you have. Is it better to have a 430 mast with the 5.4 - sure!. Can you still have fun with a 5.4 on a 460 - you bet.
Formula 160; iSonic 111; HiFly Move 105; Tiga 263; '85 Mistral Superlight.
Maui Sails TR 11.0; 9.2; 8.4; 7.6; 6.6; Maui Sails Switch 6.0; 5.2; Maui Sails Global 4.5; 4.0.