I'm confused how this visualization is meant to work. I would expect I can compare today to an arbitrary time in the past. But the visualization actually shows

I'm confused how this visualization is meant to work. I would expect I can compare today to an arbitrary time in the past. But the visualization actually shows 2000 vs an arbitrary time in the future. How is that a useful comparison? What is special about 2000? I don't care about the buying power of a dollar from 2000 in 2015. I do care about the buying power of a dollar from 2015 in 2023.