A different approach to bronze, silver and gold difficulty

The main differences between each difficulty is the number of some enemies and the amount of health and shields enemies have. With the current game player damage output leads to a lot of things taking ages to kill  in gold and even silver for some weapons and powers.

So what if there was a different type of approach for increasing difficulty from bronze to gold. I quite liked Killing Floor 2's approach for each difficulty, instead of just increasing the health of enemies it changes a number of things to make them harder and only increased the health of enemies a little bit.

For example the basic enemy the clot goes from shambling towards you on easy and then sprinting at you on the hardest difficulty. Other enemies like the Husk that shoots fire balls at you gains the ability to use it as a flamethrower at close range at higher difficulty instead of just trying to melee you.

So what if Mass effect Andromeda did a similar thing instead of just making things massive bullet sponges. Obviously Mass effect 3 manage to have a good balance between player damage and enemy health but I think it could be a interesting idea for difficulty.

I think there is a lot of things you could do for Mass effect Andromeda to make enemies harder without inflating the health too much.
Just of the top of my head things like:
Saboteurs now cast right away instead of doing their long animation.
Sharpshooters can now see cloaked targets. (maybe give all factions a unit that can do this )
Breaches now have a small gun

Just some ideas for the type of direction they could go along with other balance changes that are needed.

Thoughts?