Well, one reason is that the title of this topic you started is a question. People respond to questions, it’s as simple as that.
But there is another more important reason. As @Rolf points out, this is a discussion forum and not a place to post random pronouncements. The site has many, many readers. For example, yesterday the forum had 25,100 pageviews. I don’t know the current statistics but at one time, it was a fact that for every registered, active member of a forum there were 20 times that number who read on a regular basis.
This means that members here feel that they should reply to all messages, not necessarily for the sake of the original poster, but also (or indeed more) for the many people who read here.
Furthermore, I don’t think that anyone here chose to
This forum exists to help all hosts. You might want to keep your phone on all night for emergencies and other hosts may feel the same way. But another person reading here might be interested to know that my partner and I each have two phones (one business and one personal each) and that the phone that has the number Airbnb guests are given is turned off from 7 pm. Guests know this. This is obviously of no use to you but who knows? Another reader one day might think it’s a good idea.
So please don’t dismiss people who have replied to your post - this is a public forum so it’s not all about you.