The author goes on to give examples like smartphones, Uber, and Tesla, all of which have had serious developments in terms of impact and usability in around the same time period. Then given that Bitcoin and Ethereum have not made similar progress in that time period suggests it is not "early days".
Users continue to get scammed and lose funds. So what is it instead? Middle days? End of life? Pre-early days?
Open to ideas here. The author seems to suggest that what we're seeing in blockchains is the best we're going to get out of it. If Bitcoin were middle aged, would users put up with all the warts knowing they won't go away?
(Disclosure I own Bitcoin and Ethereum)