Maybe it is not actually a planned feature, but I think allowing to answer a post without opening it would encourage quick responses without even reading the post or checking if someone didn't provide a similar answer yet.
Remove the feature completely? I agree that the "reply" shortcut should be disabled on posts (at least by default), but not that the swipe right feature should be disabled on posts: it's the basis of the Thunder language, I think it should just be replaced with another action. What about short swipe right to save the post, long swipe right to go to the community or something along those lines?