The vast majority of finance deals with "real" assets--stocks of companies (arguably blockchainable, like the Topl thing that a sister comment mentioned), commodities (e.g. futures), logistics, etc etc

Not sure how that all can be trustlessly secured with blockchain technology

Finance is one of the largest sectors of the US economy, it is central to its role in leading the world economy.

Additionally, finance is what controls and directs the economy. It is the business of money itself, in both the public and private sector.

Banks play a central role to any economy. Digital currencies can be centralized and controlled in the same way as any state owned enterpeise.