I totally get your reasoning! We are owners at both, so I feel I can give you a level headed approach here.
Pro Boardwalk: I don't book RIV for my stays in the summer, for the same reasons listed by a couple others-- the Skyliner shutting down during intense storms. I remember one year during an 8 day trip (June 2021, I think), we were kicked out of the Skyliner queue and off of the pool deck at least 1-2 times daily. Brutal.
Pro Riviera: I agree that something new is worth a try and the Riviera has that quiet sophistication that is more understated that GF but definitely feels posh. The food is remarkable, even the quick service items. Depending on the ages of your kiddos, the SilVous Play splash area is awesome, but the main is pretty standard like BWV. Rooms and room quality, much bigger and nicer overall. Hallways and main areas area also elevated in quality and style. It's simply beautiful altogether.
My recommendation: Do a split stay and just do a couple nights at RIV to get the flavor.
DVC will move your luggage and stuff for you, even refrigerated items, so why not?

Good luck!