In this instance the convenience was the overriding factor. That and keeping the feature within a sensible budget - complicating it unnecessarily introduces more points of failure and for a relatively small quality of life improvement, it's not worth the risk. The instant transfer also provides positive aspects to how players can interact the game - it gives them greater freedom to participate in wider aspects in what's going on. We did of course consider the downsides, and other ways of doing it - Sandy in fact was very much in favour of a delay, but it was felt that this weakened the utility of the feature. The point was to allow more freedom with ship use, not add additional barriers.
Michael
And this is exactly why I'm personally for instant ship transfer. This game needs less barriers to gameplay. Not more.