What about the angel appearing to Joseph in a dream telling them to flee Herod?
What about it ? It is a biblical event, documented in the Bible. If 2 Tim 3:16-17 is true, then there is no need for God to speak to us in dreams because he has already given us everything we need. OTOH, if God speaks to us in dreams, then that scripture is not true. If that scripture is not true, then what others are not true ? See, once you open the door for extra-biblical revelations, then anything goes.