I can't see it being a deal-breaker.

With that being said, it is to be avoided where possible. Trim as much fat as you can. Unless it's going to become relevant IC at some point there's nothing wrong with leaving parts of your character's history left unsaid. I think roleplaying should be a showing medium and not a telling one. We should learn as much as we can IC, not from the OOC thread or a character sheet, so try to keep that in mind.

I understand it's a fine balance to strike.