Look at Why are empty and non empty TikZ matrix cells not equally placed?. When I wrote it I didn't know the answer so its title was too general. Now, and because I think it's not so easy to find questions/answers in TeX.SX even I know I've read them, I think this general title is not so informative and I'm considering to change it with something like
why are empty and not empty cell in TikZ matrices missplaced?or whatever you like.
Now my question is not only related whit this particular title but more general. Is it good to change question titles to make them more accurate with their answers?