As mentioned in todays Dev Diary there is a opt-in beta with, among other things, the War Exhaustion change and the removal of forced peace. This has been a pretty hot topic over the last few days and Paradox specifically asked for feedback about the severity of the penalties you get at 100% WE.
So in order to provide that I suggest that people who are invested in this issue to build an empire minmaxed for countering the 100% WE penalty and to wage war for as long as possible, including a screenshot of how much the penalties affect your empire (happiness of pops etc.)
So in order to provide that I suggest that people who are invested in this issue to build an empire minmaxed for countering the 100% WE penalty and to wage war for as long as possible, including a screenshot of how much the penalties affect your empire (happiness of pops etc.)