Creation of calculated columns is highly time-consuming and commonly they could be used in multiple projects. Additionally, in case there is any issue with the data model (e.g. reloading) being able to use calucalted columns would save a lot of time if CC are needed for the workaround.
Taking into considerations these reasons, we suggest implementing a solution to either share or copy calcualted columns between projects. Ideally, if copying, that should be possible as a selection (tick-off boxes) for several columns at once.