I was looking at the P4 prop connectors and noticed that the plastic nibs sticking up could be a source of a new problem if they get broken off from continued use or a crash. They do appear replaceable with a few screws. One interesting feature I have not head anyone speak of is that the LED on the bottom sends the light to the underside of the prop (look at the clear plastic). So at night, the light is reflected off the prop so that the craft is possibly more visible... and of course looks cool. See photos below:
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In regards to the plastic nibs on the motors:
DJI is well known for their plastics. They have never had any issues with plastics cracking.
You are just a worry wart
I wonder how aggressive is this sport mode? 45 degrees could mean excess of 70kph. I guess this why they have redesigned the prop mounting system. Is the active braking that strong that props can pop on the old CC+CCW spin on/off method??
What concerns me more is the metal leaf springs that press up. If that catches on to something when the props are off, it will easily bend. Now add a child to this recipe.. those little leaf springs look a miniature blender to me.