That is a very big assumption on your side and if true a big reason to change pathfinder since their performance is hiding other issues.
not really relevant to to Pathfinders.
Rifles not being cost effective has been said for quite a while. That people will use better options is only logical. That also leads to threads like this.
Rifles are often not replaced when lost because how much they cost/drain your recourses and they face stock and probably vetted axis elites by that time. That and rear echelons being almost impotent is the underlying issue.
Back to pio,s vision. If your mg 42 gets flanked in the first minute or 2 its not a weakness that needs to be covered by bonus sight from the first second. The mg 42 supresses near instantly most of the time. So if the bonus vision kicks in later its more balanced when there is more going on and to micro.