Data split options other then Time series i.e. split on other column values (state,category etc.)
If the data is not time series based or we want to ignore datetime column and split data based on some category, state, country etc. Not every incoming data has time intervals along with it
my vote comes from a few use cases we could not easily achieve.
-Partitionning a TrackingLog by EventDate(date) AND EventType (string)
-Partitionning a ChangeLog by ChangeDate(date) AND TenantID (string)
-Partitionning a TransactionLog by TransactionDate(date) AND Department (string)
where TenantID and EventType are columns from the Data Source
Ben Hatton commented
See also https://feedback.azure.com/forums/270578-data-factory/suggestions/15903187-incremental-data-copy for a related idea.