It has to do with the memory usage on the client and network traffic only.
Form the documentation:
Because all the objects necessary for a microflow are transferred between the Mendix Client and server for each request, the network traffic will grow when more objects are used at the same time. This can become a bottleneck, especially on mobile devices.
So having lots of objects in your requests will slow down your app, there aren’t other implications, but minimizing the amount of objects being transferred is desired. Try to adapt the logic so that the minimum amount of NPE’s and uncommitted objects are being transferred between server and client (minimize state)