It means you can't be coerced into draining your Steem Power. The more you get rid of that the more attractive it becomes to thieves.
You have a point here. People should be extremely carefull with their personal info on a site like this, regardless of lock time period you could easily get a visit from thieves. Anyone with a large amount of steem/steem power that openly share his/her address/info on a site like this is an idiot.
Don't you see some people have a large amount of Steem Power? I mean I guess I don't see the benefit of forcing the change on people who didn't choose it. If you make it so people can choose a lesser Steem Power then that would be a better solution for people powering up in the future.