OK.... Call we weird (lots of people do) but..... I kind of like the extra security prop locks give you.
Whenever I have designed and built all my multirotors I have always tried to build in a level of redundancy - This is the reason I love hex's over quads since if you lose a prop, esc or motor on a hex, it still flies and is still controllable (assuming your FC has the algorithms and logic to do this). I also install dual power bus rails from my power distribution board and always run dual packs so that if one battery goes down, again, I am still able to control the craft and bring it back home.
Now, with a quad, you do not have that luxury.... if you lose a prop, esc or motor your craft does a very graceful impression of a house brick and reaches terminal velocity quickly and then buries itself in the ground
(Yes, yes... I know TED has some clever software that will keep their quads airborne but the Inspire doesn't)
Sooooo...... with the existing prop locks, we have the security of the thread of the prop/shaft AND the additional security of the lock. This means, if the thread strips out, in theory, the Inspire would still hang onto all of its props and you could bring it back (it might fly a little strange which would alert you to something wrong). If you lost a prop lock on flight - again, assuming you had tightened your props properly you would be OK - Redundancy!!
However - the new wonder F1 pit stop 3.147 second fast change props are held on by a.....
spring!
Please someone tell me I'm wrong and there is ALSO a thread and not just a bayonet style fitting tensioned by a spring