1. The motivation for the choice of $\theta = \frac{\pi}{2}(1-h)$ from theorem 3, is not very straightforward and clear. The paper states that this choice is empirical, but there is very little given in terms of motivation for this exact form.
2. For this method, the knowledge of the homophily ratio seems to be important. In many practical scenarios, this may not be possible to be estimated accurately and even approximations could be difficult. No ablation study is presented showing the sensitivity of this model to the accurate knowledge of the homophily ratio.
3. The HetFilter seems to degrade rapidly past h=0.3 whereas OrtFilter is lot more graceful to the varying homophily ratio. It is unclear whether one would consider the presented fluctuations as inferior to the presented UniBasis. For UniBasis, in the region of h >= 0.3, the choice of tau should become extremely important (as is evident from Figure 4, where lower tau values can reduce performance on Cora by about 20 percentage points).
1. The motivation for the choice of $\theta = \frac{\pi}{2}(1-h)$ from theorem 3, is not very straightforward and clear. The paper states that this choice is empirical, but there is very little given in terms of motivation for this exact form.