The problem is that the vast majority of code will not have long term implications so long as it reaches a minimum of design, performance, and does its job without bugs. Consistency of patterns is more important than the optimal pattern for most decisions.

There are some core areas of the application that are much more important, but they are often the earliest data structures and built before the problem is known. You will not know how your code will change, so make it as consistent as possible with the rest of the system until you know more.