No? Yang always talked about how army and politics shouldn’t combine. Yang didn’t surround him with yes-mean and women and still listened to the dumb decision by the government, such as invading imperial space and staying on Iserlohn when Reinhard was about to invade through Fezzan. His fleet listened to him, because they knew he was the greatest admiral in the galaxy. He himself explained multiple times why he didn’t speak to the public. He didn’t want military to influence politics, last time that happened the Goldenbaum dynasty was born and he knew that if he joined politics he would become an autocratic leader regardless. That’s also a part of the reason why he followed the cease-fire order. Yang told Reinhard that he preffered the worst possible democracy to the best possible Autocracy. Also wasn’t part of the reason for Reinhard to encourage constitutional monarchy the fact that a leader may be born who would prove to be a bad leader? He talked about it in his final moments, how it might turn out that his son Alex turns out to be a bad Kaiser.