Indeed, WUP just does WUP but mostly doesn’t add anything. And it’s much more costly than the price you pay ($29 or less) for those plugins. And if you’re on a Mac like me, they’ll stick it to you each year or so: no WUP, no new MacOS compatibility.
Heck, I’ve got lots of Waves, but they’re all dead and buried until someone in Israel decides the fun is over and WUP is finally banned.