I understand that if you want the front and back to be different, or space them differently or something, it may not make sense, but if you mirrored front and back, it would make even placement easier. And if you did it with two separate mirrors (one for x, a different one for y), you could just apply the y mirror if you wanted to make the back wheels different, right?
Different methods for different people.
As its a beginner course as well some may come in to this as a starter to blender and so keeping it simple with less modifiers is less confusing.
You are correct though you could easily do it this way
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I believe Grant was aiming for Mobile-Game efficiency in vert-count. Linked-duplicates will save you on the vert-count whereas a mirror will double-up on the vert-count… Just something to keep in mind.
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To be honest its mostly for working blender as in most cases we would only use one wheel over in unity as its just duplicated and added to a wheel collider.
In cases where the model is going to unity linked duplicates would help the viewport in blender but it would become a seperate objects once over in unity as we export to fbx.
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