Current limiting for constant current source
Going for a separate driver for each strip will increase reliability and prevents all sorts of issues.

If the strips are not 100% equal then the current will not divide equally between all strips. The strips might be equal now but they will not be after some weeks of usage. This will result in:


The strip which gets the most current will wear out first
Strips not being equally bright
once a strip develops a fault either it will take all the current and destroy itself or fail open and all other strips will get more current (the total current remains 8.9 A) putting stress on them making them fail sooner.


Current protection: that's not a solution as disconnecting the current to one strip will force the other strips to take more current and making them fail sooner. A complex current monitoring system could be made which would shut off everything in case of a fault but I guarantee you that that will cost much more than an individual driver for each strip.

So all in all, using one 8.9 A driver is asking for trouble.