Despite tackling grounded, serious themes such as the horrors of war and individual roles in global conflicts, most mecha anime fans wouldn’t describe it as particularly realistic. Stories centered on massive robots fighting for the fate of the galaxy are hard to make scientifically accurate, and most mecha shows require their viewers to suspend their disbelief dramatically to enjoy the narrative’s finer details.
Source:https://www.cbr.com/scientifically-accurate-mecha-anime/