Establishes procedure, and there are different rules on what can be done with it (the government doesn't really care, as Snowdon and Manning showed us, but if it can be brought to court and maybe historically it can be shown to be a difference).
Also, there's the convenience for those implementing it. If it's more of a faff for them, it's more likely to fail.
But convenience is always a powerful compulsion, which is why it's leaned on and used a lot.
Just go back to needing futures to actually be fulfilled in kind.
And maybe limit/outlaw complex financial products.
These would be a solid start to fixing the issue of the unsustainable, and irrational, not to mention unconstructive economic growth of the last 60 years.