CCP may feel that more internal Alliance conflict that comes from Alliances getting bigger is good for the game, when it also can lead to more players getting frustrated and quitting due to game mechanics.
Alliances feel forced to take on corporations that may not agree with each other’s politics because they can help with a war situation fleet fight, where previously these independent corps could do their own thing, while occasionally risking being the much-disliked “neutral logi” and get shot if the other side could find some neutral friends to counter.
CCP Lebowski has an idea that might help both limit the scope of wars and permit allies in a war to remain separate entities - now may be the last time to address this topic for many years, as I expect CCP will move on to another equally challenging problem that needs solving.