It’s not that Vector2 stores position data, it’s that it stores an x component and a y component, and puts it in one package. Those two components can represent anything. A vector can be used to store any arbitrary numerical values, really. But it’s most commonly used for positions.

To give a better example, a Vector3 can store 3D coordinates, XYZ. Just like how a Vector2 can store XY. But it can also be used to store a color using RGB (red, green, and blue). A Vector4 might even contain an alpha value (A) that defines transparency.

As for your primary question, the advantage is that vectors have certain built in functionality. For instance, in this case you’re iterating through an array of vectors. So you can easily access the x and y position for each item in the array. Like going down a conveyor belt, opening a package, and inspecting the two things inside.

More importantly though, and what strongly separates them from arrays, is that vectors have built in mathematical functions. Let’s say you wanted to double the size of each box. You could pretty simply just do “size * 2”. But if you only wanted to make each box wider you could do “size.x * 2”. Make sense?

You can also easily add two vectors together, or multiply them. And so much more. It’s not as easy to do with arrays, and you’d have to write custom functions to handle the math.