Build fighters series is literally taking a giant fighting mecha war in the future full of death, murder, despair and war and mashing it with a kids toy show which only purpose is to advertise its mobile suit designs so people can buy the kits.
Plot and stryline is essentially thrown out the window because the people behind the whole damn series is too lazy and thought "hey, we just have to make the main protagonists mobile suit look the coolest and overpower everyone at the end with some sort of legendary power" and then slapped together the whole show based off of that