Yea although I'd say this rather goes in my favour. I mean Nation Battles restrict ur choice of girls that you can use. But after what you've said, most people won't be able to play these stages unless they get the help of helper squads (which aren't restricted as ur own team). This leads to a state where the helper squad does not only "help" but does most of the work. And this is kinda wierd in my opinion, because I'd say how far you can progress should mostly be dictated by how far you are and not that the progression is made by someone others squad which isn't affected by the restriction. I mean if that's the case why restrict the girls you can use in the first place?^^ So for example they could've adjusted the power lvl of the maps if they disabled helper squads so that more people can play the maps but the players are actually the once who do the effort to complete the maps. -This would be one view
The other view would be that it's fine to exclude so many people. Personally, I'm not much further than you. I'll propbably have no chance at all at completing Winter Rose. But that must not be that bad. I mean alot here have probably played now for quite a while without really having to complete anything anymore. But on the other side we were still getting stronger since we kept getting new girls and kept lvling them. So it's not that bad in my opinion to have a reason for why you have to keep on upgrading and evolving girls. And this is simply achived by having harder maps.
While Im at it, just further random thoughts^^:
- it might be a bit complicated since dmm could have been at a complete lvl than we are at this moment
- Helper squads help though to diminish the discrepancy between nation with lots of girls like Lilywood and nations with few girls like Winter Rose