The patch notes announced that we now get 4 sail attempts every day. It also stated that you will be awarded a random map piece when you collect the Knight's and King's bounty in assistant.

This is all accurate, however what they forgot to put in is the following:

Map are not stack-able. If you already have a map and claim another one, you lose the map you were holding and it is replaced with the new map.

This may sound stupid to some. But I will illustrate where it can be useful.
Everyone has a left map including you. You claim your knight's bounty and are awarded a right map. Now you have a right map instead of the left and don't have to try and lose your map piece. This can prevent the previous blockade situation we had several months ago.

SO yes you must now plan how you claim assistant rewards and guild benefits to manage you map pieces.