I think this discussion shows just how hard it is to please everyone. Every single one of your opinions on this is valid. And yet, there are conflicting viewpoints and thoughts on the reactions. They were added because they were thought to be a fun addition, something new, something amusing.
Some like this one, some find that same one not needed. Some never use that one, others see that same one being used all the time. They’re there if you want to use them. The majority of the forum members likely don’t even think twice about their existence.
Again, your personal opinion is valid. Maybe you can also see that we aren’t able to please all of the people all of the time, and the reactions are silly and fun, meant to be an entertaining diversion, nothing more.