Cutouts for Strip only, beneficial?

IMO, the only way cutouts might "add" something when open is if they open the uncapped side while CLOSING the exhaust side off. None do that "that I know of". ......and I haven't looked for any that do, because it's never interested me. But all the ones I've seen basically leave the exhaust side open when they open the uncapped side. This allows the exhaust to go both directions and it seems to me that wouldn't be beneficial to good flow. Now If you could make a dedicated long "collector" on the uncapped side, and somehow fix it so is sealed off the exhaust side while opening the uncapped side, AND that transition was good and smooth then you might be into something.