baggage is an interesting, if somewhat dubious, term I think for life experience.
baggage contibutes to who we become, how we approach everything
some of it is negative - and hopefully we learn from it
some of it is positive - and hopefully we enhance it
is it that either they are there for a good time, not a long time so don't want to deal with some of the ups and downs of life
or
they want someone who hasn't lived yet - and want to be/are a control freak?
never can figure out anyone who says "no baggage please" -

what do they actually want?