My first war, I got a single point as a Meridell peasant. And I worked really hard for that point, but I just hadn't trained or invested in weapons. The first few plots with battling I participated in, I made sure I trained (continuously, not just during the events -- most of the time, it was just once a day) and slowly upgraded my weapons (winning ones in the plots helped a ton), and I did better each plot. TFR, I was able to cap against all the baddies, though it did require some of the items TNT gave us during that plot and quite a few losses while figuring out the best strategy (or just getting lucky).
I've spent years and millions of NP training and equipping my pet. I want the hardest baddies in a war to be at least as hard as the hardest baddies were in the last plot. If people are willing to put the time and NP into becoming better battlers, it's only fair that their efforts are rewarded in BD-related events. Just like people who practice games tend to do better in DD and GMC, or people who do lots of puzzle-type things might do better in puzzle-based plots.
I'm not a battler. I pretty much only battle for plots and wars, though I completed DoN for the trophies and tried out the new BD so I'd understand it for the next plot/war (and then made it a daily once I realized there were loot drops). My battle pet is at the 600 str and def boosts, but that's not even the max. Nor do I have top-tier weapons. I'll be fine with it if I can't cap out; if I do cap out, I hope I at least have to struggle, because I still have room to grow as a battler, and it'd only be fair to those with stronger, better-equipped pets than mine. If I can easily beat all the waves, there'd be no incentive for me to continue training to reach the last few boosts or to upgrade my weapons for the next event.
If you don't want to train, don't. But just know you won't do very well in wars or plot battling. If you want to do well in the next event's battles, train regularly even after this one ends, gradually upgrading your weapons when they're not inflated. Meanwhile, do what you can with what you have, balancing your other goals with how well you want to do in this war, and keep your war goals realistic based on the amount of effort you put in beforehand.