The Giant Robots within Mecha Anime are drawn with a certain neuroticism for their craft that is shared by the animators.
Macross is a lot more musical than many mecha anime, and this could be a vital marketing tool that separates it from competitors such as Gundam.
Mech exoskeletons are a key facet of the mecha genre, where humans pilot a large robot with attached weaponry. Anime fans may recognize the trope from Neon Genesis Evangelion, Code Geass and ...