I think CWs are a good thing to have on here. It's one of the many ways it makes fedi a nicer place than other similar platforms.
But I also do think that CWs shouldn't be necessary because they're the treatment for a problem emerging from the mindboggingly stupid "let's put most activities into a global context" platform design.
You often hear complaints about missing CWs, but I also do see the other side.
You're lead to interact with your communities as if they're the only ones who are going to receive your posts. And if a community is open about certain topics that would require a CW outside of it, then it would feel strange to add a CW to posts intended for it.
It's like the insect instance example I used on my website, but we can apply it to any microblogging without instances as well: If you're interested in insects, and you mostly follow insect lovers like you, it would feel unreasonable to add a CW about insects. You just want to share cool photos of insects with the community who shares your interest.
It's also easy to forget that your followers aren't necessarily the same demographic as those you follow. They aren't visible on your timeline after all, so there's nothing reminding you that they exist. And your post will even go beyond your followers thanks to boosting/reposting/whatever you want to call it.
Honestly, there's just no right answer. I wish yinglet speech was CWed because I can't stand it, but if I were to voice that request people would talk shit about me. Yet, CWing politics is reasonable. What's the correct standard?
The answer is that there isn't one. We're all a huge crowd of people with many different views and standards that are impossible to consolidate. This platform design is rotten to the core and these problems will never stop.