Rationale

By using Transaction Write Sets, the master has to do slightly more work to
generate the write sets which is helpfull in conflict detection. This allows
users to easily move into GR since transaction-write-set is a requirement for GR.
Also, the new default will make users to easily enable binary log writeset
parallelization on master to speed up replication.
https://dev.mysql.com/doc/refman/8.0/en/replication-options-binary-
log.html#sysvar_binlog_transaction_dependency_tracking

Server Changes

transaction-write-set-extraction = XXHASH64 : Enables the optimal method for
generating the write set hashes.