New poster, but long time gamer.
In terms of National Objectives, I believe they are too restrictive and create a gaming experience that is heavily scripted.
what I’ve done in the past with other A&A titles and similar grand strategic war games is create a National Morale or Will Track.
For WWI, I would establish a 3 Theater Track - Western Theater, Eastern Theater, and Mediteranean Theater. Each starts at ‘0’ and moves in favor of Entente or Central Powers on a set critera, such as IPC’s gained or lost on a single turn in one of the theaters for example. Then set a prescribed turn to end the game on (say 10 turns). If no one has reached ‘immediate’ victory by gaining a certain number on each of the theater tracks) then the game ends and whichever side is ahead on 2 of the 3 theater tracks wins a conditional victory.
I’ve found that this creates a lot of tension and opens up strategies with many options and many different paths to victory. Obviously some conditions would be considered heavily on the tracks, such as the loss of Paris or Berlin, or the High Seas Fleet controlling the channel. Additionally, the game can be played out in 2 to 2.5 hours a big plus for me.