Well, the thing about paper wallets is they aren't really wallets. They are backups of a single address and private key. So you have to very careful with them. For instance, you should not try to spend a partial balance stored on your paper "wallet" as there are no change addresses made automatically. These printed wallets are also more susceptible to damage and harder to recover. I speak from experience, unfortunately, having lost several Litecoin via these type of wallets.
The Bitcoin wiki has a good discussion of the downsides. I'm pretty sure that Dash paper wallets are based on Bitcoin paper wallets.
A paper wallet is the name given to an obsolete and unsafe method of storing bitcoin which was popular between 2011 and 2016.... This method has a large number of downsides and should not be used.