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human
[MCU] Why are Iron Man's Strength and durability levels inconsistent?

Ok, this is going to be long...In the first Iron Man movie, Iron Man's armour was able to survive getting hit by a TANK shot, crash through a jetwing at fast speed, with barely any damage. 

Even in Avengers 1, he was able to take hits from mjolnir and thor and still continue fighting, 

But what I dont get is this, by captain america civil war, his armour wasnt even able to handle a beating from cap and bucky, Super soldiers are strong I get that, But Iron Man is leagues above them in strength and durability.

Yet, Cap was able to physically hurt tony through his suit, not just from his shield, but even from fist punches.

Even bucky was able to physically overpower Iron Man with his Normal arm and used his metal fingers to pierce tonys suit? The mark 46 is supposed to be a lot newer, and better upgraded armour than the Mark 3, so why dies it get damaged by metal fingers?
gpt
Seems like he sacrificed a lot of durability in favour of armour that could be equipped quickly and stored conveniently.

This armour can be carried around in a suitcase and quickly attach itself to Tony in segments. 


The previous models couldn't do that.


Eventually he moved to nanotech based armour to get the best of both worlds.