Hi we have two K13 micra in the family one has done 70,000 miles and is on original front arms.
What is failing on your arms the ball joint or the bushes.
Replacement each year definitely not normal are you using OE quality parts.
Most parts have 12-24 month warranty so if they fail due to manufacturing defect they should be replaced free.
I worked at a Jeep / Chrysler dealer and the old PT Cruise would eat lower arm bushes. Cars would offer need new bushes every service but this was the exception. Most other cars ive come to no front arms last at least 50k.
Hope this helps.