One of the things that always disappointed me with this movie is that they didn't really do anything to update Mothra all that much. She's pretty much exactly the same as she was in the 60s. The closest thing to an update or change is the addition of an ancient enemy, Battra.
Compare that to the rest of the returning monsters for the Heisei series. King Ghidorah's origin is completely different from his Showa counterpart, and I liked it. It showed they weren't obsessed with tying their hands to the old content and willing to update the monsters with some fresh ideas. And the time travel aspect and tying his creation into Godzilla's origin almost made them perfect mortal enemies in my mind. And with the Son of Godzilla, they had the neat idea of actually having him, ya know, GROW UP as the sequels progressed. Granted Little Godzilla sucks and I want to punch him in the face, but actually having him grow from film to film immediately set him apart from Minilla. And then you look at Mechagodzilla and MOGUERA, who have completely different origins and identities from their Showa selves. That's not to say I prefer one version over the other (actually, I prefer the Showa in most cases) but the attempts at recreating these monsters and giving them new origins was actually kind of neat. It kind of makes me wish Gigan, Angurias, and some of the others got in on the fun. Even Rodan got a new evolved form in "Fire Rodan", and having him share the same nest as the Baby Godzilla, tied him close to the Godzilla family of sorts.
And then you look at Mothra in 92 and its just...yeah, I've seen that before. And unfortunately, Mothra is one that they typically stay pretty faithful to, but in a bad way where it just feels like I'm seeing the same things over and over again. Tokyo SOS felt like it included a Mothra greatest hits clip show. Credit to the Rebirth Trilogy for at least giving Mothra new powers and forms as the series progressed and trying to evolve the history and personalities of the fairies. They didn't completely succeed, but hey, A for effort.