All three games have aged a fair bit, but they are still the same masterpieces as when they first launched. You can get used to the gameplay pretty easily, but story and the cinematic presentation are timeless, they’re the best parts of the games bar none. The only true clunkiness comes from the menus, which are pretty confusing and unintuitive these days.
You do have a point, but for splatoon 1, most victory animations are shared between boys and girls. You only miss about 2 animations like the splattershot victory animation. Splatoon 2 on the other hand had gender and species animations for everything, so I’m nervous how they pull that one off.