That’s funny but there actually is a reason—power.
The work is too far from the sun to use solar panels—not enough sun light.
So it has a small plutonium (—which is, I suppose, just the right element to power a probe to Pluto!—) reactor on it, but it can only consistently generate about 200 watts at any given time!
So they’re using the low and slow transmission to get the bits back to us ‘cause their modem is lo-po!
Like 300 baud?