The double diaphragm disc clutch mod is inexpensive, easy, and effective if you're drag racing, but it's overkill around town. I prefer the PCW heavy-duty single disc diaphragm clutch spring replacement.
If you not building a bike for all out performance I'd stay away from the DD mod.
Cheap and easy but, can lead to snapped driveshaft or, worse, pending on mods an how hard you ride.
Removing the wire from the clutch basket, the half size friction plate, the clutch boss spring, and spring seat, and replacing with a full size friction plate adds enough grip for most guys. If you want more, you can hit sean up for a PCW clutch spring. Its stronger than stock but, not as strong as the DD.
It doesn't make sense to you because you are just getting into the Vmax world. The DD mod has been around for 35+ years and worked great for many many owners. It does eliminate slippage completely and moves to other weak points. Though driveshafts can snap it's very rare. Rare enough that shafts are cheap and plentiful.
The stock spring doesn't get "weak" but anywhere near that percentage. MAYBE losing 5-10% at most of it's original holding power (and that's a big maybe).