Enkidu, three times its been explained to you.
If you still dont understand the difference between what a Flamer does to a 4man unit relying on armor as compared to a 6man unit, as well as weapon crews, as well as on garrisons then thats your problem and repeating the question like a parrot isnt going to get you a different answer.
You didn't answer my question. My question isn't whether or not a pio flamer is equal to an engi flamer, my question is, why should it be? Are combat engi flamers better in most situations because their targets have smaller unit counts? Yes. They also cost more to buy and reinforce than pios. Not only that, but flamers are the only upgrade soviets have to their vanilla infantry where Ost have more options. If you want a higher dps upgrade, get an lmg on a gren; if you want to clear out a building, get a flame pio.
If pio flamers were buffed to make them force off 6 man squads just as fast as engis force off 4 man squads, then I can't think of any reason why engis should remain a 240mp unit while pios only cost 200. Isn't the flamer discrepancy the sole reason why engis are currently more expensive?