Considering that the merger of Eth 1 and Eth 2 may be coming in December. Is there a need for the EIP 1559 upgrade?

Considering to the fact that it's been said that devs are working hard to initiate the next stage on the journey to ETh 2.0 by merging the current iteration of the Ethereum block chain with the next iteration as early as Dec. Is there really a need for EIP 1559? Or am I the one missing something?