I have no idea what you mean by "I've heard", yes, I've heard several people think that this won't be that successful. And therefore "I've heard" it.
"It's actually a step forward for Bf"?...
You may think that it's a step forward for Bf.
It's not a fact nor what everyone else thinks.
In my opinion, I've pretty much only ever played Battlefield and in my opinion, this feels odd and like a step back in my opinion. If they had released this back around 1942 time, then it would have made more sense to me. Since that is also focused on older warfare.
Going from Battlefield 3 and Battlefield 4, which is modern combat, and now back to this?... Nah, don't like it.
FYI, this is entirely my opinion