Currently, you can create a mess, if you want. For example, just color the same status indicators (new, completed, ...) differently in every project, and the "my assigned tickets" account-wide overview will be as colorful as the rainbow, even if all tickets had the same status.
I think these "organizational objects" should be account-wide, so "new" has always the same color in all projects, for example. You should then decide on a per-project basis which of these you want to use. So if you want to a "on hold status" only in some project, you could do that.
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