You’ve probably already seen this thread, but it details the differences between the classic app and the new app. There is indeed quite a bit of functionality missing in the new app, but some of that seems to be design decisions. ( The topic title is a clickable link)
As for Google mini, that’s an issue with Google, nothing to do with SmartThings. At this point, if you already have Google Chrome and other google devices, you get extra functionality out of the Google voice assistants. Otherwise, right now it is easier to use echo for Home Automation or with your other speakers. But these two products keep leapfrogging each other in terms of features offered, so I do expect google will catch up in another six months or so.
