Scenes are a workaround, yeah, but keeping up with all the filtering when the input stereos or bus configuration changes can be a huge pain and can really bite you if you miss fixing even just one scene.
It’s probably not really an issue when you’re doing a week of rehearsals then take the show out on tour for a while, but when every week amounts to its own show and you never get a straight-through rehearsal it’s pretty easy to miss something.