If you are talking about coins that became obsolete after 2017, then there is a point. One example is TRX. Used to have a market cap of $15 billion. The current market cap is less than 1/4th of that.
Is it not a crazy thing that a project only a few years old can be considered old in this space? And Defi coins are even worse, if it is 2019 it is considered old and that is not even two years old!
Just goes to show the hype industry of defi and how short their lifespans are. If you think TRX is obsolete now,,, How about Waves:) I feel sad every time I think about it!