Two things I can think of. One is the developers simply didn’t put that feature at a high enough priority level to implement it. Another is that I’ve seen that feature abused on other forums and sites where it is available. If someone asks a question and people answer it honestly but not to the liking of the person asking, I’ve seen people delete questions and then what could have been useful information to others is lost. People can do the same here by putting the question in the body and not the title and then blanking it with a period as you’ve mentioned, so it’s not a really good excuse. Have you submitted it as a suggestion?