@Cloudycoastphotography ,cant help you with the
smart controller question ,as i have never owned one
but with regards to changing props ,then there is no set in stone ,recommendation for the number of flights ,or flight time ,for changing them
there are so many variables ,that contribute to the life span of props ,such as flying style ,abrasives such as sand if flying near the sea ,how they are stored ,the list goes on and on
all you can do is during your pre-flight check ,is to inspect them carefully for any damage ,and also the condition of the hub as well ,you can of course have a set replacement interval written into your maintenance schedule, if you are flying commercially but really as long as the props are not subject to damage, from coming into contact with an immovable object them they should last a considerable time