Yeah, the "everyone wants to return detail" Is an important piece I forgot from Turn A
But I definitely would say it's anti-war. I think the issue is that people now try and extrapolate from that that anyone who engages in war is bad and becomes a monster through war, while Tomino's point was never really that war makes monsters of us, but war by its very existence is tragic. In CCA, it's the pacifists who are the bad guys on the Earth side (Though they prize money over peace), and Londo Bell are heroes for fighting off Neo Zeon, but the pain they all go through in that fight is what makes the war bad. So obviously fighting in a war doesn't make you a good person, it can even make you a hero, but that fighting will hurt you and those you love, and you will live to find that status as a hero a hollow and painful reminder of what you've lost.
That's definitely how it feels in G-Reco; By the time of Bellri's maturity, he's pained by conflict, he seeks to end fights as quickly as possible, and is hurt when his weapons do too much damage (Like the photon torpedo's use against the Wuxia squad), he even has a panic attack after killing Rockpie (Though that might have more to do with their relationship as newtypes). But he's never presented as anything other than the hero. In fact, it feels almost as if Tomino was rejecting the very modern assertion that war is an endless cycle and that if you engage in it you just perpetuate it: The Megafauna crew engaged in it, particularly in the final battle, with the specific goal of ending it, eliminating the most dangerous weapons so that dialogue was forced. The idea then, again, is that war is necessary sometimes, and therefore is not inherently evil, it's just that it's inevitable outcomes are what are evil, the pain caused by conflict and loss.