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by db579 1962 days ago
It may well be that it does take payment processors t+2 days but I think the point remains that it should not.
2 comments

Even if trades settled at T+0 (overnight) there are still rules against good faith and free riding violations in addition to liquidation issues.
The reasons are a combination of human factors. Technologically it is possible for atomic transactions to be completed far earlier, but commerce is a web of interactions between mostly real humans.