I understand that "is reader beware you're in for a scare a content warning" is A Funny
But if you've ever heard of the disingenuous bullshit "study" that "proved" that CWs are Bad Actually because they make people More Anxious to engage with a text, Not Less,
their lying bullshit methodology was basically to slap the moral equivalent of "reader beware, you're in for a scare" on things and call that a CW. Which, yes, made people anxious to engage, because "haha, we might trigger you, haha [Jaws music]" is not a CW.
Warnings for content, much like warnings for allergens, require specificity to be useful.
For example, when the DLC for Outer Wilds came out (no spoilers) it added a screen on boot that went HEY THIS DLC IS SCARY!!! WATCH OUT!! and that made me go through it at a snails pace and enjoy it way less than I would have until I actually got to the scary bit and went "oh, that was actually fine"
It was worse than if I had just been completely blindsided by the scare.