Before revision:  However, the study regarding Heterogeneous Information Network (HIN) is still limited, because the existing HIN-oriented GCN methods  suffer from two deficiencies: (1) they cannot flexibly exploit all possible meta-paths , and some even require the user to specify useful ones ;
After revision:  However, the study regarding Heterogeneous Information Network (HIN) is still limited, because the existing HIN-oriented GCN methods suffer from two deficiencies: (1) they cannot flexibly exploit all possible meta-paths and extract the most useful ones for a target object, which hinders both effectiveness and interpretability ;