The Brave literally starts with Gamera blowing himself up to save humans. It's kind of always been his thing.
It's not about the sterile fact of
whether Gamera does it, it's about the way the production treats it on an emotional level. The Showa movies piled on Gamera's torments and injuries to a grotesque degree that made them seem downright sadistic despite the stylized and fakey nature of the gore, and none of the characters seemed to care much about how deeply Gamera was suffering.
The Brave inverted it by having the hero really, really
not want Toto to endure suffering and strive to stop it. It's the same reason
Digimon Tamers is my favorite season of that franchise -- because monsters fighting isn't treated as something cool and fun, but as a tragedy that the children who love the monsters wish to spare them from. It's a matter of empathy, and of the maturity with which violence is treated (and no, maturity does
not mean being more graphic and gory, it means being more thoughtful about what violence means and how it's used in a story). This show just seems to be going back to exploiting Gamera's suffering as spectacle, and that's not something I want to see.
So far, this series hasn't done much to give us reason to
care about Gamera. He's just this entity that predictably, mechanically shows up to save the kids, destroys the other kaiju, and goes away. They've focused so much on making the fights intense and gruesome that it feels kind of empty otherwise. Maybe the remaining episodes will add something more, but it would've been better to do so sooner.