I have mixed feelings about specific content warnings. On the other hand, warning people about content they wish to avoid is good. On the other hand, content warnings can easily spoil plot twists, and the more specific they are, the more they spoil. It would be nice if there were a opt in/out system for content warnings that only warns you about the types of content you want to be warned about.
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No, I said I have mixed feelings, which means that I can see that providing content warnings that are specific enough to be useful without being so specific as to spoil the game can be difficult. It's still worth attempting, and it may be better to err on the side of giving too much warning than on the side of not giving enough warning, but avoiding spoilers can also be important. For certain types of games, giving away the ending can completely ruin the experience. When I write a game, I want people to be able to enjoy it.
Also, avoiding content that actually traumatizes people is just one reason for content warnings. Far more common is people avoiding content because it offends them or because they just don't find it appealing. I don't think any of my games are likely to actually traumatize anybody, but I'm sure the moral guardians would find a lot to take offense at.