@Calfy this blog post is one of the better ones I've seen discussing the reasons for their quite liberal use
http://v21.io/blog/uses-of-cws
this platform, unlike some others, has consent at the core of its user experience. this includes consent to view stuff that may be upsetting for readers, even if they're boring everyday topics for the poster.
for food, consider someone with an eating disorder. seeing food pop up in their local or global timeline may not be received in the way the poster intended. same goes for pets, someone may have just lost their furry friend.
the #tw lets others opt in
Overall I do very much agree with your sentiments, however, I totally get that different people have different tolerances and this platform has been a sanctuary for many for several years. We should be mindful of that.
Also, I 100% feel anything politics, hate related (most main stream media...), and cross posts from rubbish like wordle needs to be hidden behind a CW 100% of the time.
Oh yeah, and sports, tv shows.. pretty much almost everything that could trigger an emotional response...