Agree , don't understand it either.
Looks like airplane was already designed and build, when only then it was found out about the spin problem.
And of course , i.s.o. re-designing , fixing the problem with a parachute system is more handy.
most accidents with spins was from turning base to final,
on these low altitudes a parachute is of no use anymore, but as well for the opposite rudder etc. procedure there may not be sufficient altitude left.
so in real life it doesn't make a difference i guess, but it gives a strange feeling.
cheers