Before you read on, bear in mind that Diah lights can hold either of these cells. That is to say, we've accommodated for both!
This decision was a tough one and it came down to use cases of our inner circle of friends & family and their feedback.
The CR2032 will last 5 times longer than its rechargeable Li2032 counterpart. From what we've learnt, our first-time users of our prototypes would rather replace batteries than recharge them every 8 hours.
So in the end, you can switch to rechareable Li2032 if you prefer.