I don't think that there is an issue in single wallet address. It just helps you to prevent trackers from tracking your financial information and activities. However, if you are worried about using single paper wallet address then you can save it to your Blockchain.info account as a watch only address and create another web wallet with the dynamic addresses to receive funds and then transfer to your paper wallet either directly or through a mixer to avoid others to track your information.
There's also a security issue i believe.
Once you make a transaction from an adress, your public key becomes known, which means a hacker/cracker will only need your private key to get access to your funds.
If you had used a new adress, they wouldn't had either of the keys, until you spend, but the bitcoin would already be transacted by then.
As of currently this isn't really an issue, but it could become one in the future if computing power increases ( Quantum computing ).
I don't think that there is an issue in single wallet address. It just helps you to prevent trackers from tracking your financial information and activities. However, if you are worried about using single paper wallet address then you can save it to your Blockchain.info account as a watch only address and create another web wallet with the dynamic addresses to receive funds and then transfer to your paper wallet either directly or through a mixer to avoid others to track your information.
Don't see the why do I need to add the paper wallet's address as a watch-only address? As I understood, your suggestion is to first receive money with the online wallet, and then send them to the paper wallet myself. Such that only I operate with the paper wallet's public address directly? But this would double the transaction fees, as I know.
No, he means that you simply import the adress of your paper wallet into blockchain.info (
https://blog.blockchain.com/2016/05/31/how-to-use-watch-only-addresses/), although there isn't really a reason to.. You're not going to spend the funds anyway for a long time, right?
