UPDATE:
As of July 11, 2019. A patch was released which has removed the added recoil while being suppressed.
This video covers what I believe to be a big issue in Insurgency: Sandstorm which is the suppression system.
Along with explaining how it works, I also added a couple of possible solutions that could make suppression better and still effective.
Goggenator's Take On The Game (Inspiration for this video) :
https://www.youtube.com/watch?v=ngmzunUQLrE
Mikey's interview with ShackNews:
https://www.youtube.com/watch?v=oyKgqb7ssEs
1. The first solution and probably the more obvious one, is to make suppression work the way it does in Insurgency 2014.
Make that suppression blur effect more intense in Sandstorm just so it would still effect your visuals more but your weapon will still act the same way as if you were not suppressed.
The main problem with that is it throws out everyone who loves the idea of suppression actively shaking your gun around in a uncontrollable manner.
2. The other solution I was thinking about is a hybrid suppression system.
2a. Shots fired from 0 - 35 meters would only add an audio and visual effect but will not effect weapon mechanics.
2b. Shots fired from 36+ meters would issue a full-on suppression effect which includes added sway/recoil.
Distance may need to be tested and tweaked to figure out at which range would be best.