The massive vitality bonus from immortality does give a massive score boost, does it not? 1.6% is still exceedingly rare in consideration of how many runs you'll actually be making. This doesn't bias towards runs, but players -as it stands, if you're making hundreds of attempts at the node, there's still a good chance you'll never even get it after finishing the whole game when it releases. Others will, however! It's just plainly unfair regardless of whether it's optional. Everyone should get a similar, enjoyable experience.
It's hell even if you savescum. If you don't, it's over an hour of dedicated grinding, on average, before you get one (still like 20-30 minutes if you do).