What? What do you mean?
Even if these projects will be successful in the future, there is really nothing to gain from them. So why focus your interest on them? If you have $1,000 worth of a CBDC coin, it will remain to be $1,000 in the future. That's because a CBDC is a stable coin, because that's a fiat coin. That's issued by central banks. There is really no growth in them.
The hype of DEFI has waned down already. The current trend is more on NFT.
There's no need to theoretically explain it, and I think you're not really understanding it at all.
Seems like very few projects pursue this field and make you show it as 1
I found some projects like https://hedera.com/ do your research and see for yourself how you understand it, and I don't want to argue with someone who doesn't understand it.