Well, what brought it up was reading up on using lists in Unity, and their example was
List<T> myList = new List<T>();
To me, it should be a no brainer, "Hey, I said myList was "List<T>" so it should probably be a "new List<T>"
If you are coming from a C or C++ background, know that C# is a different language.
If it helps you transition, you can think that in languages like Java and C# all variables are secretly pointers. They don't look like pointers, but myList is really a pointer to List<T>. If you type SomeObject obj; the equivalent C++ would be SomeObject *obj;, a pointer rather than an instance.
Again if it helps to make the transition, think of it as a conspiracy. The writers of these new languages don't want you to know about pointers. They want you to forget pointers even existed. So variables are really pointers to objects rather than objects; instead of the -> operator on these secret pointers they use the . operator to try to confuse you. That's also why the languages use dot for scope resolution rather than ::, to make you forget about your true roots, trying to tempt you with an easier way rather than the true path of hard work and struggles.
Once you are indoctrinated to the secret cult of modern programming languages you might discover that it frees your mind to work on other more important issues. But for now, they are just trying to cover up the truth. Pointers are hidden to just use a dot. Scope is hidden to just use a dot. Who knows what critical truths of programming they will hide next behind the dot.
Be careful about drinking from the punch bowl, because until you do you can rest assured that there are serious performance penalties for hiding pointers, that hiding pointers this way will upset every performance metric, and that every time a pointer is hidden this way a puppy gets drowned. This is why it is important to stick with C and C++ that have their roots in 1950's model, rather than those hippie/punk/goth kids using languages with a 1990's model. If you are forced to use their languages, always remember that you really are dealing with pointers when they want you to think you have objects.
Until your mind makes the transition, know that in these sneaky modern languages everything is secretly a pointer, to appease the secret pointer objects must be made with <i>new</i>, and they want to deny the existence of <i>delete</i>. They are a cult of satan using a powerful drug, be careful when working with the code lest it addict you.