There's more to it than that:
Lack of transport on a huge map Actually I'd say it might be the distance not the amount of vehicles but still a logistic nightmare
Trees and mostly those French bushes
2 logis that take for ever to resupply and drive back to the battle
Bots shooting Garands as quick as AKs or M4s
The insane amount of enemy armor that we can't counter because we have no supplies and the friendly tanks just get LATed through trees
Not seeing any enemies on the first few flags...
...that leads to only CAS having fun for most part
Of course if a tank is hit and needs repairs it takes ages just to get a repair from a logi (and even longer to get to main and back)
There's probably some more staff too.
I think that's sadly not possible. The Vietnam maps didn't really change. We adapted our tactics, we can use smoke now, but most of them are maps with at least some cover, terrain changes and most importantly trans helis and logis that allow for quick transport and a proper supply chain. On Kassel there is of course some cover but between the objectives there is just an open field (and some trees but that doesn't really help). On Vietnam maps we can just call a trans heli to not waste time trying to cross an open field but that's not possible on Kassel.
The change I think would be the best is making a smaller layout for it. It would concentrate the enemies more and allow for better logistics.
But of course as this is not a game made by a multi-million dollar company but by DEVs working quarter-time for free, we can't expect everything to be perfect. Suggestions and discussion are always great but we need to also remember that those people have a ton of other staff to do.
Also probably dragging LangMaster into this thread would help to show his perspective on those issues.