Right, switches that have radios inside them need something to power the radio and switches that don’t have radios inside them need a traveler wire to the master, so it’s an issue either way.
Again, maybe the device manufacturers will have some ideas.
There is one more alternative, which is to use a smart switch cover that fits over the existing switch and physically moves it. We just discussed this about a week ago with regard to a higher voltage switch as a non-wiring option to make it smart.
They are not aesthetically as nice, but it’s a really simple solution for some use cases, so might be worth looking at: