Compared to REs Pios have:
1. Longer sight range
2. Nondoc flamer option
3. Higher close range DPS, which means that you can cover your MG-42 with pios - if flanking enemy stays at range you can just rotate your MG, if they are closing they will have to deal with pios' MP-40s.
I'd say that sight range is strongest aspect of pios, followed closely by flamers.
I just mentioned all of that in an earlier post on this thread. R ech also have at least 3 unique things. Unfortunately I need to repeat myself:
1) Vet1 accuracy bonus + vet 3 5man
2) Free rifle nades with the fighting position.
3) double upgrade while still getting sweeper
4) Tank traps because occasionally they're useful, just like volley is useful if you have green cover.
Yes pios have decent point blank dps because they don't have any at all other ranges. Pios and R ech are neck in neck when they meet each other on the battlefield, 50/50 chance of winning and it all depends on positioning. Don't know why u bothered to mention that. You basically said pios aren't a complete dud in combat.
Speaking of complete dud, I wouldn't mind CE getting a price reduction to 150.