I've been taking to decrewing my own mg42s with flamer pios attacking ground so I can recrew them with said pios for their sight.
Also, there are a ton of maps that I believe the designers were explicitly trying to make mgs ineffective on for 80% of the battlefield. Few maps even have an open enough area for an mg42's arc without a bunch of shot blocking objects or a very obvious flanking lane circumventing the entire position.
You are missing the aim of pio + MG, sure range is a thing, but you forget that:
- MG will suppress a squad pretty quickly, rendering her 75% less effective, but will also deal less damage to that squad
- Pio can rush this suppress squad and shred them, cause they are not affected by this "damage reduction on the suppress squad"
- Bonus: If 2 squads are coming, you can suppress one, attack them with pio (shooting at a squad will not allow her to take off the suppress ) then suppress the other, etc.