What makes the hunter spam of late so unbearable is the artillery bombardment they will rain down on you from who knows where (too much range and too accurate even without line of sight). What’s worse, it’s gas mortars. That’s literally a war crime. Of course a gas mask won’t save you…from gas…if only we had a mask that filtered out poisonous gas, like some kind of gas-mask (dripping with sarcasm). The fact that we can only mitigate gas damage down to 70% is very problematic if we should expect to regularly come up against it en masse in combat. A mask should at least cut the gas damage in half, with the chemist perk cutting it another 25% or more. Right now gas masks are about as effective as trying to use a bandanna to filter out the gas. If you insist on giving players such impotent protection early on, then you might as well give us a bandanna to start with instead of a gas mask , and then later we get the mask that provides an adequate level of protection. The lack of handy way to don our gas masks without going into our menus is also an issue when we are busy running for our lives.
On a tangentially related note, I think that the entire IGA area (except inside buildings) should be covered in a thick fog of poison gas. make us wear our gas masks for the entire mission. The reason I say this is because we get a piece of lore at one point where someone at IGA is calling for help because of the robot attack and they say something along the lines of “one stray bullet andy this entire place will be covered in poisonous gas.” I think that this would just make that mission a little bit cooler and more memorable.
Edit: I forgot to mention the mechanic of holding your breath while aiming. You should also be able to do that while not scoped. It would have two uses outside of aiming: preventing gas damage and making you harder to detect when enemies are nearby.