I dont like how a coop game encourages me more to play at duo / solo and than a full party.
I think that the health for enemies should be increased for solo / duo ( Still lower than 3+ ) and 3 / players should be decreased to encourage some party play.
Additionally, for the same reason, make more ( 1 - 2? ) grimalkins able to spawn during solo CSKs.
We dont need to penalize players who like to play solo (not that actually we want to play solo) just because you dont like it. and neither nerf it if the group is 3-4 players because you want to make people to group up.
the reason why player solo is because monster AI is way to nerfed down to the ground, wolvers used to track bites and they were menacing with that, zombies use to be quick in slash you and then jumping hug to bite you were annoying, man even the freaking menders used to have attacks now they are just sitting ducks. in short: every enemy in the game is just too slow even on elite.
another aspect that killed the reason to go in group is the lost ability to revive your teammates with your own health, with the introduction of spark of life this killed the coop aspect of the game, is true that with spark of life you dont need to revive yourself with energy which gradually raise with each revive (10E, 50E, 100 E and so on) also they give emergency revive which fill your life once you die. but guess what happen when a player lose that emergency revive? they dont want to revive because either dont have spark of life or dont want to use their spark so they lie in the floor until you revive them with your own sparks or they leave the party. of course someone like myself who rarely die in the game and have like 300+ sparks want to revive them but also is annoying to do this procedure.
why? because i have to click on their display and then "revive" which mean i have to waste some seconds to revive them risking also myself to get killed because i have to stop myself to click "revive". isnt like when we have health share to revive a teammate which was just to stand near to their body and hit attack and done. and i honestly dont get why people hated this, of course you give half of your health to revive them but as spark of life is freaking optional to revive them if those people dont like to share their health to someone who die or die so often just dont do it, like people dont revive players that die often with spark of life.
now if they bring back old Enemy AI for elite, and the health revive you will see more reason to group up instead going solo.