I think it's too soon, and do not think it's disingenuous or hiding anything to wait. People do not tend to talk about hard things and problems when they first meet. Let's say I met someone and they're on about all their failed relationships, or all their "baggage". Really? *That's* the early impression they want to relay? Next! And it wouldn't be that they scared me off, but because they turned me off with all their negativity. Why would I want to hear straight off about all of somebody's problems? I want to know their good stuff, at least to start. Things that will pique further interest. Give me a reason to *want* to know more about them. Does that make sense?

I can tell you that I'm not going to be dumping all the issues related to my emotionally abusive ex-BF on anyone I might get talking to(!)

If everyone just threw the worst/most challenging/whatever stuff out there right off the bat so as not to "waste" each others' time, I'm guessing they would pass by a lot worthwhile people. It pretty much sounds like an expectation of perfection. Good luck. NO ONE'S perfect. Why lead with one's "flaws"? It's like looking for work. Who would make themselves look like crap on a resumé? Or go into a job interview listing all they aren't good at?

See if it's going anywhere first. No need to short circuit things before they even have a chance to get started.