Why would anyone retune their kalimba? Well, I hope you DO tune up your kalimba every few weeks or so, at least to maintain its correct original tuning. However, once you learn the skills required to brush up the kalimba's tuning, you also possess the skills required to explore alternative tunings - you just need to push or pull the tines a bit farther than the very delicate moves required to fine-tune the kalimba.
But again, why would someone retune their kalimba to a different tuning? Because different musics are available to different tunings, and because different tunings help produce different emotional expression. If you ever start to get bored with your particular kalimba and what you can do with it, you should consider changing to another tuning to see what new music might speak to you.
This article walks you through four different possible retunings for the 11-note pentatonic kalimba. So, if fear or uncertainty were preventing you from taking the plunge and retuning your kalimba, you now have the tools and guidance to jump into the river and baptise yourself in the flow of ever-changing musical possibilities. Really - once you begin to explore new tunings, it's a whole new world!