In the same fashion that these questions about attacks to textbook [RSA](http://crypto.stackexchange.com/questions/20085/which-attacks-are-possible-against-raw-textbook-rsa) and [ECC](http://crypto.stackexchange.com/questions/26067/which-attacks-are-possible-against-raw-textbook-elliptic-curve), I was wondering what are the immediate drawbacks of applying NTRU Encryption directly, without any padding scheme, such as [NAEP or SVES](https://eprint.iacr.org/2005/045.pdf).