Another problem I have seen in dungeons is this.
Player 1: it's my first time
Player ?: player has left the party
So while yes it's nice to know it is also something some are afraid to announce because of that behavior. That group it was the tank that was new and decent gear and pulls and we ended up with 3 different DPS leaving because he said he was new. I finally told him to stop saying it lol. On another note don't assume it's a speed run if you are doing total randoms in DF, as others have said do your due diligence and check their gear if you are unsure.