Because I'm not here for nsfw content, and I'd rather not see it when I'm browsing random sfw content, so I block it all. I'm not anti-nsfw, but keeping it separate seems like a good idea. If others don't agree that's fine. I'm not going to complain if this sub includes nsfw content, but I won't stick around either.
That seems like it could work. Maybe it's worth a trial. Iirc though the posts still show up in my app, but are just blurred out, which isn't a great experience.