Then it isn’t a filler. I never said I don’t swear, but have greatly reduced it. One effect of reduced swearing is that when swears are used, they have more punch.
I’m not sure why you’re so invested in debating that people who habitually swear won’t insert swears into unrelated thoughts, but the only support I offer is to listen to someone who habitually swears speak. I don’t want to sound like that, so I make the effort not to.
My choice on how I speak and type doesn’t impose anything on you.