This has been discussed a few times before and the conclusion has always been this isn't something we want to do.
It would get super confusing if the flows can go in any direction. If you were zoomed in to a part of a flow, you'd have no idea what direction it was running in.
Arrow heads would help (and there is a PR in the works that will add an option to display arrow heads). But I still think switching directions like this would be confusing.
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