cost of living is highly relevant when you compare salary data because it's one of the primary factors that determines the cost of labor.
If you pay a Berlin salary in SF nobody's gonna show up because that doesn't cover your apartment rent. It tells you little about how much you effectively pocket. If you want to get some use out of this data you need to adjust it for purchasing power.
You’re right. Which is why it’s great that this link was posted. You can now take this available data and combine it with you understanding of the CoL on the various locations. Otherwise you’d only have a feel for the CoL.
If you pay a Berlin salary in SF nobody's gonna show up because that doesn't cover your apartment rent. It tells you little about how much you effectively pocket. If you want to get some use out of this data you need to adjust it for purchasing power.