You only need to insert a memory card if you're updating the remote controller firmware from the memory card. In order to do that, you need to download the firmware here and place it in the root of the memory card.
The memory slot is actually a great feature, you can put in cards from your phantom or other craft, Mavic, Spark and playback footage. Go into album / sd card. . You can obviously watch on the monitor. Also plug in an HDMI cable to an HD tv and enjoy your footage. It is generally very stable. A great playback platform for you.