Hi Bob,
A friend of mine once described it to me like this...
Say your selling your house, where your house is your domain authority, your rooms are your page authority.
You have a great big nice house. Every room is in great condition, freshly remodeled, etc.... EXCEPT the kitchen! Your house is still great, but the value has certainty dropped because of your bad kitchen. In fact, some buyers are even turned off because of your bad kitchen.
Same goes for the other way around... If you have a broken down house in the ghetto but you have a killer master bedroom no one wants to buy your house.
If that didn't make sense, you want to get that ideal house with great rooms.
I guess the answer to your question is DA is important and to ideally find link opportunities with good DA and PA.
Its not going to hurt you, but its not going to benefit you as much just targeting PA