lol, I had no idea the suits had so much history. I concede. But even if all you say is true, it makes no sense in this movie. If it was a one off and only made to battle against Hulk, then why is it used in this move to battle a hoard of rabid animals? Seems like another variety would have made more sense.
And if Tony's such a genius, can't he combine the suits together and just make a "super suit" that's fast, strong and has firepower?
Man you really have me sporting my ChadTower approved comic book nerd hat today dontcha?
You cant be gleefully unaware of the source material and critical of it, all at the same time. The Hulk Buster armor was the closest because Veronica satellite tracks Bruce Banner so that if Iron Man ever needs the armor, its nearby. It felt implied that Banner wouldn't have been much help unless he was in a suit. So it seems to be to be a choice of convenience.
"one suit that can do everything" is such a cop out. There's an evolution of the suits, they keep getting better and better, heck there were 2 or 3 revisions in the first Iron Man movie alone! The Mark 50 "bleeding edge" armor , seen in Infinity War, is supposed to be the best overall armor. Despite being a comic book movie, they've kept the suit tech somewhat grounded in reality. So for the suit to be faster it has to be lighter. For it to be tougher, it has to be heavier. They've established this in the 6 previous movies Iron Man is featured in. (I1,I2,A,I3,A:AoU, CA:CW). The Mark 50 is probably the closest they'll get to a "super suit", and even it has its short comings.
Nobody wants to watch an invincible hero or villain.