Even just getting above the boiling temp of liquid nitrogen is a really big deal. Liquid helium is something we will eventually run out of and is largely dependent on fossil fuel extraction to be collected. Helium can't be recaptured after it escapes an open loop cooling system.

LN2 is so much cheaper to run and it's sustainable. We'll never run out of Nitrogen so long as there's power to cool it. LN2 is cheaper than craft beer.