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Your observation about WLS JMS DD is basically correct (except that I am not sure if the performance statement is correct).
Yes, messages that are on a member that is temporarily down will not be available for consumption. The recommendation is to target your JMS servers to a migrable target. The member will be migrated to an active WLS server is the original hosting server fails.
Oracle's recommendation for consuming from a DD is to use WLS MDB or SOA JMS Adapter. Those containers transparently consume from all members of a DD while handling connection pooling, security and transactions.
You can find the details about using WL S MDB at
Hope this helps.