You're right, it's just a way to give some people more flexibility in mounting options.
If you already have the Rayvn bridge or another bridge that allows you to mount the Sidekick via the mini-rail and that is your dedicated setup and you are not interested in a quick change capability, then the dovetail adapter won't give you any benefits.
If you have a bunch of different bridges that accept dovetails and you want to change back and forth between them, this might come in handy. Also for the very brave who want to test the (nonexistent?) Sidekick recoil rating, this will allow you to mount the Sidekick as a clip-on in a Wilcox flip mount.
Right now I'm doing this stuff as a hobby, but I have a website for these projects at
jv-innovations.com