You might be working on a long answer to a question. If you had accidentally click away, then all your progress would be gone. It doesn't even have to be a click away. It could be something as simple as not noticing your low battery. Or, you might be tired of typing up the answer and you want to take a break.
To avoid losing progress, I suggest adding a button that can save our work so you won't have to type your answer all over again. It could be a Save Your Work button, but your answer would still be hidden from every one else. Then when you're done, you can post your answer.
In the end, it will just be a little way to save your work so if something were to happen, your work could still be saved. If it's possible, it could even be an auto save.