publicEncryptionkey & publicKeyId still required for encryption ?

[ehanoc]

Given that we are using ECIES now and moved away from RSA.

Does

 /**
  * public key in PEM encoding format
  */
 string publicEncryptionKey = 1;
 
/**
  * A number used to later identify the publicEncryptionKey. 
  * When a message is sent to the creator of this contact, and it is encrypted
  * with the publicEncryptionKey, this identifier is also sent, so the recipient 
  * knows which key to use to decrypt it. If the recipient creates multiple 
  * keys for multiple pairings, then they should remember the publicKeyId that
  * they chose for each one, so they won't have to try all the keys during decryption. 
  */
 int32 publicKeyId = 2;

Still make sense keeping?

AFAIK, encryption will be through a symmetric secret generated by an agreement (ECDH) after public key exchange.

We should only need the publicKeys of the other parties to perform both encryption and signature verification?