I have thought of this topic because I don't invest much in altcoins, just trading it to profit. I'm talking about the one you will buy that you would HODL in the long term and keeping it in your cold wallet, hardware wallet, paper wallet, or whatever you do with it as long as you keep the currency itself.
It is a mistake to choose a project based on the promises of developers to create this or that technology. Believe me, developers can promise you anything, but to create it is much more difficult. You need to invest in something that has already been created and is working or has a working sample. Investing in promises is very risky and stupid.