Wondering the same thing! These new releases tend to get a lot prettier but they almost always lose important, lesser-known features
Google: "Ok, lets finally update the UX from a decade ago so we can thread messages... oh yeah but you can't actually configure your voicemail account with your carrier, or even view what your voicemail number is until you revert to legacy google voice. Actually just use legacy if you want to be able to reliably delete messages too"