No Apple Watch app for new app (yet?). 2) to get widgets on phone you also must select which favorite scenes you want. Go to widgets and physically select the ones you want (up to 8) so a check mark appears.
There is a very very long list of features and capabilities that the old app supports that the new app does not, so welcome to the club… as for an alternative to fumbling with your phone in the dark, try installing HomeKit and using Siri which can be invoked by the usual voice button in the car if you have CarPlay up and going.