1. Relies entirely on automatic RST parsing, which remains error-prone. Better discourse understanding would likely improve benefits.
2. It seems that such RST parsers are mainly available for English (as such, the submission also mainly conducted evaluation from English to German), making it hard to generalize to other languages.
2. Using external TextTiling tool may limit end-to-end learning of document boundaries.
3. Limited linguistic analysis of what discourse phenomena the model has learned to handle.
1. Relies entirely on automatic RST parsing, which remains error-prone. Better discourse understanding would likely improve benefits.