The downside to Aulani is the major increase in dues for a Beach resort. You should be able to easily book Aulani at 7 months, outside of major holidays.
I don’t think you can look at Aulani through the same lens as VB or HHI, though. One, hurricanes literally almost never hit the Hawaiian Islands. The last real big storm to hit Oahu was Hurricane Iniki way back in 1992. Hurricane Lane, in 2018, was the wettest ever, but didn’t make landfall. So you can see catastrophic weather events are pretty far apart. Florida and South Carolina have a strong potential to be hit with big storms every single year. The weather patterns in the northeast Pacific just don’t send big storms that way.
Second, the construction is much different. Aulani, under a thin patina of theming, is basically two large modern curtain wall towers. Interior hallways, very little exterior trim that is susceptible to decay, etc. Much different than the low and spread out (and in Hilton Head much lower lying) VB and HHI. At the end of the day, Aulani gets less weather exposure than even any of the WDW resorts.
When Aulani opened in 2011, non-subsidized dues were $5.73 PP, versus VB at $6.78 (non-subsidized) and HHI $5.68. Today, we're at $9.14 PP for Aulani, $12.85 for VB, and $10.73 for HHI (and $9.36 for OKW, for good measure, which was "only" $4.98 in 2011). So, Aulani is definitely increasing at a slower rate than the East Coast beach resorts. Finally, since 2011, dues at OKW, BWV, SSR, AKV, and BLT have all increased more, percentage-wise, than Aulani.