Edit: Also, I think most interview coaches recommend framing the personal shortcoming in a story with lessons learned/growth story as well. So, might as well as ask the question that way.
People who haven't prepared for this one are usually stumped and don't know what to say, and you aren't learning anything interesting from people who have prepared a model answer.
Beware, this could just give them the impression that you like playing the cheap psychiatrist is some sort of depressing make-believe game. Stop.
Or go full circle and ask them "Where do you see yourself in 5 years?" too.
An example is, I spend a lot of time in writing unit tests, in order to deliver projects on time, I set a fixed amount of time at the end of the deliverable to write unit tests, in order to provide a stable code set, and a set of tests which can help with changes in the future. Another one can be, I work in a silo mode, so in order to offset that, I send e-mails/communicate with my team members more frequently, in order for them to be aware of what I am working on and where I am in my projects, also, to be able to solicit feedback from them.
I actually had this a few years back, and this was my default response, without thinking. It got a nervous laugh, and we moved on before I realised it had slipped out.