Plate armor isn’t exactly spandex, but it’s also not a tank you wear on your body.
And like, any male ranger/thief/whatever agility based class character is not going out in a metal speedo, so why exactly are female warrior/strength/heavy armor + weapons type characters in chainmail bikinis?
The agility defence is the official worst argument when it comes to fantasy armors.
And a little bit more on why the “women aren’t strong enough to wear armor” myth is just absurd.
Remember, in times of war they used to fit hundreds of soldiers in this stuff and expect them to fight all day with heavy weapons. Armor had to be light enough allow an “average” man with training to use it reliably, which means it’d be easily usable for the “average” woman with the same training.