"Altered mindset" is exactly right! That's the whole idea behind these Vanguard style shapes. From following this thread, I too have gotten caught up in this shorter, narrower, parallel railed phenomenon....so I had to build one and see what all the fuss was about. Me, 56yrs, 185cm, 79kg with 2 yrs SUP experience. Normally I ride and 8'3"x 28" shortboard style shape. What I decided to build is 7'5"x 27"x 3 3/4". I know I could/should have gone shorter and narrower, but frankly I didn't have the minerals to do it this first time. These shapes? Wow! They're a blast! I've had mine out in horrible winds and chop, competing crossing swells, you name it....and I'm amazed at how stable this shape is. Surf? I've run it as a thruster with FCS Nexus h3 fins and it carves a turn nicely for such a wide tail. As a quad I've run the medium C drives and she's smooth and fast and more pivoty in the turns. Either way, I love this shape. Seems I've always heard wide tails don't turn...BS! I guess because of the wider plan shape throughout this shape seems more "skatey", which is cool by me.
I'm not trying to hijack this thread to show my board. I'm certain the DEEP boards are far superior a design. There have just been a lot of questions lately concerning stability, volume, etc, and I wanted to give some relatable experience to try and help out. I'm a convert to this shape, and I think it's particularly well suited to SUP because it does allow you to go shorter and narrower than you might normally. Get a Minion, you won't be disappointed.
And the Riviera Door. I have two buddies that had them. The most excited they were was when they sold them.