Male armour is as impractical as female armour in , just in a different way. All those spikes and massive shoulder parts only serve one purpose: to impress. If one of two equally able fighters actually wore such a set of armour and the other one wore a suit of plate armour from the Middle Ages, the former would be at a great disadvantage. By the way, that also applies to helmets and weapons in most fantasy games. They might partly even be based on items that have really existed, but were purely ornamental, not designed to actually be used in combat. The main aspect of male armour in most fantasy games is to show off (you could also call that "aesthetics").
Both male and female armour are usually impractical, so that's not a valid argument for just making female armour more realistic. If you want male armour that is as revealing as female armour usually is, you've got a point, though - that would only be fair.