We advise all users to initialize their account at the soonest opportunity.
When someone sends you LSK, they will use the address in order to do so. Since the address is an abbreviation of the public key, it is less resistant to a collision than the public key is. As soon as you make an outgoing transaction, your public key can be recorded on the blockchain and therefore will be collision-free.
In other words, making at least one outgoing transaction from your wallet will even further improve the security of your LSK address.