Can we get an explanation about them?

With 3 or more people in the party, you almost never see a single one of those shock or freeze souls. But with less, you have to fend of 3 of them every three seconds.

While it's manageable in Ghost in the Machine, with most of the places in the mission giving you lots of open space to dodge or shoot them, it's much harder to do the same in Heart of Ice. Those souls can appear right in your face, ready to explode, and they can still explode when you slash them in melee.

Why isn't the amount of souls scaled to no. of players? Why do you get 3 souls every 3 seconds when you solo/duo? Why isn't there any souls with 3 or more people?

This was reported long ago. Why isn't this fixed?