Jaeger-LeCoultre

I used to own, but no longer own and now kind of miss, the Reverso 8 Day Sun-Moon. I loved wearing a big rectangular watch with a large, long-reserve handwind movement in it. I loved its totally romantic (rather than pragmatic) set of indications: moonpha...  

As for your question, I also noticed this detail and I thought it was kind of strange too. However, consider the implications of having a heated hand for the other indications. In my eyes, they wouldn't look as good as what the painted ones. So, my guess ... 

but I'm having trouble seeing the aesthetic value of it!

They wanted those hands, which are placed at the corners, to match the blue painted elements in the moon phase and day-night indicators, rather than matching the central hands.

A small detail I didn’t know! 🍻

but here’s my guess. The choice to differentiate the hour and minute hands from the seconds and power reserve hands could be functional as well as aesthetic, as it allows them to be clearly distinguished. Thus, when looking at the watch at a glance, only ... 

I'm not sure the difference is stark enough to have that effect, though.

Just an impression I had looking at some video of it...

And very well written as well. I absolutely love a power reserve on a manual wind watch. This is a stunner!

...  

This xgt case and watch has the 8 day power reserve on the verso side, meaning no blue hand on the recto side. This is alas no solution fot the other complication on your beautiful watch

But notice that watch has a heat-blued seconds hand that matches the main hands, as does this version: ...