It's arbitrary <edit> that the S9+ doesn't (yet?) have One UI 2.5! Unless there's something extremely special about it keeping it off our devices (and there isn't), the biggest plus for me is it permits third-party launchers, like Microsoft Launcher (my preferred), to use the default Android 10 gesture navigation like One UI Launcher can. That gesture navigation, to me, is far superior to Samsung's weird 3 invisible button variation which breaks down too much to tolerate. It can and should have been available to us from the start as it was a built in limitation by Samsung to leverage the new Android gestures for their own bland & proprietary launcher.