This lower register vocals are more appropriate for them and they should stick to it. They are a dance/performance focused group and having them sing high notes a lot on their songs isn't feasible for their high energy choreography in live performances. Sure they can have the occasional Yeji high note on the bridge (she can pull it off live), but in general this is how their vocals should be on their songs.
Man. Finally. I feel like this is a return to form for Itzy, after a few comebacks I wasn't a fan of. I know this isn't the title track, but I'm hoping that this is a sign of things to come, and we get 2020 Itzy back. Still missing Lia, though!