I'm no Cardano shill and would never buy at the current prices, but if I believed they had what it takes (which is more than just sound tech) to siphon off much of the Ethereum crowd and bring in more nation-state level projects in the coming years then the valuation isn't that crazy.
Again, I don't have such lofty assumptions and will be waiting for smart contracts before I consider investing, but to say it does nothing is patently false- and if my time horizon were in the multiples of years then I'd probably consider inclusion in the large pool I'd spread my play-money across.
Is it worth $44B right now? Obviously not, but investment is a bet on the future, not current performance- and I've been wrong a lot.
[0] https://iohk.io/en/research/library/
[1] https://www.coindesk.com/from-paper-to-cardano-blockchain-io...