User blog comment:Xilinoc/Ch. 589 - The Shooting Star Project: The Old and New Trust/@comment-24384892-20140716152243/@comment-5693502-20140717060038

In Aizen's defence he wasn't really focusing on mass destruction like Yhwach is. Aizen just wanted to go to the Soul Palace and kill the Soul King, he didn't really care about anything else. Not to mention his Arrancar army was tiny in comparison to the entire Gotei 13 and he didn't create them to attack the Gotei directly either so it's kinda justified that the Gotei 13 wouldn't suffer any deaths (leaky reasoning I know). However while Yhwach's main goal is still unknown we clearly see that he wants to bring as much death as possible to fuel his own power. This arc brought us a proper war where the Gotei are being attacked personally so it would be completely inane if no Shinigami died this time. Also the Wandenreich have their own set of low-ranked nameless cannon fodder (the Soldat) to parallel (and help kill off) the Gotei's own nameless cannon fodder. But yes, the Gotei have suffered some lasting damage, which is expected since this is a war where both sides are supposedly equal in terms of strength (with the Wandenreich being arguably stronger).

You're right, the war is definitely far from one-sided, but it's definitely moving in the favour of the Shinigami (at the very least). That's why I'd prefer more 'justified' deaths, in addition to the deaths of many nameless Shinigami, to occur on the Gotei side. I can see the Gotei suffering a pyrrhic victory somewhere down the line (or at least I'm hoping they do).