For the uninitiated, generally NSFW is for sexual contents and NSFL is for gory contents. People may want to see one but not see the other at any time for any reason. I have seen this feature requested over the years in Reddit but it never happens. Maybe now some instance can finally implement it?
Most of the resistance to it on Reddit was because NSFL content was technically not allowed on the site at all and adding a specific tag for NSFL material could be seen at legitimizing it. But they didn’t heavily moderate it either so I don’t see the point in refusing a tag for it if they’re not going to do anything about it themselves either.
What really blows my mind though is the subset of people that want a NSFW tag to mean Gore/Death and a separate PORN tag for titties and such. I mean, we already have established terms for those so why not stick with what everyone already knows them by?