Why can't we select multiple photos and edit all of them at once using the sliders? It's so intuitive and works in the old Photoshop importer. I have to be honest I don't remember if it works in Light Room Classic, but it should be implemented in CC.
In Lightroom Classic this can be done by flipping the small switch to change the ‘Synchronize’ button to ‘Auto Sync’, but this is prone to errors. For example, if you edit a photo in this setting, and you think this is a great photo that deserves to be rated five stars, then you’ll find that this will rate the entire selection five stars. It is handy though if you know what you are doing.