Whenever that question comes up - which happens more often than it should - I always concentrate on my inability to swim and my current plans (and barriers) for rectifying the situation.
> Tell me one thing you think your (current|ex) manager could do better to manage you
This sort of question is, for me, a good opportunity to start talking about task delegation - particularly as a learning opportunity - and how difficult it can be to get it right. Making sure, of course, not to give the impression that the previous manager was a complete failure at it (circumstances derailed the plan, etc)
But, I’m also all about getting things done, I’m blunt with my direct managers after I have established a relationship with them. Yes I do soft skills interview prep and I’ve done so for the last 20+ years. My success rate at interviewing is close to 100%.
In contrast, someone who doesn't feel pressured to take this job or else will seek a more competitive pay, and maybe leave for another job if they're dissatisfied.
This kind of question ("Tell me about your weaknesses," "Tell me one thing you think your (current|ex) manager could do better to manage you," &c.) often test for one of two behaviours:
1. Diplomacy and tact, and/or; 2. Ability to regurgitate a template answer you can find in any rudimentary book on handling behavioural interviews.
It takes extreme skill to get a candid answer out of everyone, so it is easy to get gamed by the tactful people at the expense of people who don't read a book about how to ace the interview.
But people who don't read books about interviews can be very competent at their actual jobs.