I don't like the PA retcons. PA is not supposed to be like a tank, it is supposed to be as mobile as a real soldier (the lore before was that power armor was supposed to feel and operate like a natural extension of a soldier's body, that is why the Vault Dweller, the Chosen One and all of the human followers could use then right away without any problem), offer good bullet protection and increase the user's strength to allow soldiers to carry heavy equipment and use heavy weapons without need to deploy heavy vehicles (those were all grounded because too little resources to make them move). Also about feeling like a tank in FO4, I don't feel like a tank at all because it is the only armor who gets damaged (at all) even by shots of low caliber pistols or someone using a switchblade... How is that a tank?
Look at FO1 and FO2, the characters in PA move and run at the same speed and they still fit through normal doors and all of that. All it does is making the character look a bit bigger/buff.
When I was in the army, I was in the artillery division and I had the "pleasure" of ride, operate and maintain quite a different number of armored vehicles (M60 Patton, Leopard 2, M901ITV, M113 APC, Pandur 2, Bravia Chaimite, Commando V150, Panhard VBL, Armored Humvee, M88A2, M60A1 AVLB and M728 CEV) and they do not feel like FO4 power armor either.