Ding ding ding.
I'm still in the "new and exciting" part of my life, but crypto just doesn't solve any interesting problems.
The decentralisation of crypto currencies is great (i.e. there's no central bank that can devalue its currency to prop up their national economy), but it's way too volatile to actually be useful as a currency. Would you agree to be paid your salary in bitcoin? Without adjustments if it drops relative to the dollar? Heck no. It's a speculative device, not a currency.
Smart contracts are cool too. Zero trust transactions etc. Conceptually I think these are really cool, but I see no practical need for them (for 99.99% of people).
Blockchain as a data structure, again for 99.99% of applications a DB and PGP do the trick. (And I'm still waiting on that 0.01% to show up.) I'm a software engineer by trade, and firmly believe you should pick the simplest way to solve a problem, not the coolest.
All of the different uses of crypto are "cool" but pretty useless. A solution in search of a problem indeed.