Does Update On A Partitioned Column Cause Fragmentation

Does "Update on a Partitioned Column" cause fragmentation ?

See example below :

Suppose I have a table as below that has approx 3 million rows and growing :

1) Table ABC :
file_id number
status_flag varchar2(1)
file_Content clob
date_created date

2) This table is list partitioned on Column "status_flag".

Column "status_flag" can take 3 values "A" or "B" or "C"

3) A file_id can transition from 1 "Status_flag" to another. [ A--> B , C--> B, B-->C, A --> C, etc ]

This means its possible to UPDATE the "status_flag " - the partitioned column.

Question :
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1) Would the movement of rows from 1 partition to another cause fragmentation ?
2) Or Instead, should this be achieved by maintaining 3 tables - 1 each for every "status_Flag" as Table_A, Table_B, Table_C

This would mean that, if file_id 1, changes "status_flag" from 'A' to 'B' :
-- The corresponding row from Table_A will be created in Table_B
--- The same will be deleted from Table_A

This would still cause fragmentation ... with the overhead of Inserting a CLOB column from 1 table to another.

3) How to determine how much percent of the table is fragmented ?