If memory serves, low profile armor while awesome against unarmored targets and small weapons fire, is many, many, levels below the abilities of actual armored suits.
Low profile armor is a "why not" safeguard. The protection and abilities they provide are substantial when compared to the unarmored. If you could be bullet proof, vacuum proof, crush proof, super strong, and able to fly with little to no drawbacks, why wouldn't you use it? However, the low profile armor has been unable to protect the toughs in certain situations, which I would imagine solid armor would do better. These suits for example
. They managed from a full plasma bath, something the normal low profile armor would not do. As evidenced by the precautions taken here
(not to mention various situations in the past). If the toughs are lucky the new armor can at least perform as well as those ablators did.