This is so true I've had this conversation with a few mature married sisters.
Aside from even considering marriage at this point I just think it's a good idea for one to get out on their own to develop a greater sense of self sufficiency/ responsibility and get to know themself a little better.
My background has lent to a little more self sufficiency in itself because I've never really been coddled. Currently I spend about 85% of my time alone just getting things done. I'm also in a foreign language congregation alone so I'm already responsible for myself in everyway.
Being in a different congregation from your parents helps too. I know I've changed somewhat since leaving my parents' congregation, though it wasn't nearly as drastic a change as when I moved out.