Rifle+Rears are 480 MP combo. 280 if you consider that its your starting rear.
x2 Pios are 400 MP combo. 200 considering that you use one starting pio.
I assume, in your test you mimic Pios getting almost instantly into close range, from behind sight blocker.
So whats the problem here? Why pretty much 80 MP difference, should grantee a win against x2 pios, who successfully managed to get into close range without taking damage on approach?
Not to mention even if they did flank you like that, just back off and spread your units utilising range, pios have literally almost 0 damage at ranges. Garands are cool and all, but SMG is the SMG.
That's actually about 3-4 seconds of charging to be on top of them. If you actually leave cover and run away, it's even worse. You can't really go playing dora the explorer as you know an MG42 is lurking somewhere, and it's a 3v3 map, meaning you can't really spread your forces thin. With 42 sight, they can easily on such maps stay out of sight, but not out of mind. Not only 80 MP difference: faster and cheaper reinforce (in 3v3, first 5 minutes dictate the next 15). Also, if you go and try to utilize the range... you'll most likely get pinned by the incoming MG42.
EDIT:
This sounds like something that could only happen on Winnekendonk. The opening engagements on those fuel points/cutoffs are always funky
Don't see 2 pios having a chance against rifle + rear in cover in 95% of situations
Perhaps. Did test it out 4 times. RE+Rif do win, but not by a margin you'd expect. I mean, place a single spio in green cover and let rifles + RE charge it... Of course, you would never charge a spio. Point is, I used to think that rifles are not units that can be charged in cover by anything but a spio/assault gren/PGren. But turns out that simple engineers can charge them and... maybe not WIN. But definitely induce a larger MP expenditure, and cut down on map control more than you'll lose by retreating 2 pios.