The problem I have with the term NSFW is that it implies that everyone shares the same idea of what is or is not safe for work. It's a completely subjective definition. It really seems like it is up to the person who is browsing the internet at work to determine what is going to put their job at risk, and not everyone else.
I agree that it's not completely well-defined. It definitely seems like blocking all NSFW content would maybe block some content you would have wanted to see. This is just the price you'll have to pay for blocking NSFW content, and there's no easy way around that.
However, the comments on alexanova's post definitely made it seem like some people would be more than willing to pay this price. So at the very least, they could be given the choice and left to choose for themselves.
I'm not in favor of blocking any content on Steemit that isn't illegal in its hosting country. If someone has an issue with content somewhere being unsafe for their workplace, they should probably rethink browsing there while at work.