I expect the target audience for this change is people whose reading speed for whatever reason can’t keep up with dialogue when sound effects captions are inclu

I expect the target audience for this change is people whose reading speed for whatever reason can’t keep up with dialogue when sound effects captions are included. There are a variety of reasons for that and it’s sensible to provide “sfx/bgm on/off”, though it shows how little investment is being made in accessibility by the media industry that Netflix has to do this in their language selector rather than the TV being able to do it for all feeds.