quoted from steam below:

Removed Tags

We haven't often removed tags from Steam, so we've built up quite a list. The set that we've removed today are done so because they no longer serve a good purpose for establishing connections between games or describing unique and useful elements of content in the game. Many of these tags have alternative options on Steam that better describe the content, and already have a high degree of overlap in application.

For example, both the "NSFW" tag and the "Mature" tag have a very high degree of overlap with more descriptive tags such as "Gore", "Violent", and "Sexual Content".

Some of the other tags that we are removing today are perhaps too subjective like "Well-Written" and "Masterpiece", resulting in disagreements and inconsistent application. Some tags just don't apply to very many products, such as "Drama" and "Ambient".

And lastly, there are a number of tags that apply to specific intellectual property, an attribute that community-sourced information like tags is not well suited for. These collections of intellectual property are typically already covered by the developers and publishers setting up franchise pages to collect together officially all the content shared by that IP.

Here is the full list of tags being removed:

• 3D Vision
• Ambient
• America
• Blood
• Crowdfunded
• Cult Classic
• Documentary
• Drama
• Dungeons & Dragons
• Electronic
• Experience
• Feature Film
• Foreign
• GameMaker
• Games Workshop
• Illuminati
• Kickstarter
• LEGO
• Masterpiece
• Mature
• Movie
• Narration
• NSFW
• Roguevania
• RPGMaker
• Warhammer 40K
• Web Publishing
• Well-Written