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Handling assets other than BTC is kludgey in Bitcoin. Financial people probably aren't in love with Bitcoin's irrevocable transactions either.

Private ledgers generally don't/shouldn't use mining at all, so computing power doesn't matter.

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Also smart contracts on top of Bitcoin and Ethereum have some fundamental problems.

https://makebitcoingreatagain.wordpress.com/2016/02/10/5-cha...

Why not just use a big SQL database that they all control? What's the difference between that and a private blockchain?

There is a continuum of different threat models and solutions, with the big SQL database on one end, the proof-of-work blockchain on the other end, and stuff like Stellar and PBFT in the middle. Unfortunately the field is pretty immature and people tend to pick a solution and then rationalize up a threat model to match.

Youre talking only about the storage which doesn't matter. You still need a system built around the database to handle known ordering of entries and immutability. So you can either hack something together or just use a blockchain which is pretty well understood and simple tech.

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