Disaster might strike at your next tournament…
You might accidentally drop your racket and break it during a match.
You might accidentally damage your rubber on the corner of the table.
You might have rubber that is somehow illegal.
Your racket might get stolen.
Unfortunately, there are problems that arise.  Fortunately, most players are prepared enough to have a backup racket; HOWEVER, most player don’t like their backup racket as much as their first racket.  Many players have backup rackets that are different from their primary racket.