I like my UI super fast so that new hierarchy animation isn't an improvement to the UI, for me. Now I understand people got accustomed to transition everywhere with the iPhone so yeah keep it but as an default option. When someone asked for an "off" switch in the preferences panel, the unity dev said he'd rather tune it because an option would branch the code, which is extra work to maintain. How about an alternative to an off switch, something that won't branch the code? Simply add a hierarchy animation speed float in the settings, or just expose that so we can UnityEditor.hierarchyAnimationSpeed=0f; in our editor code Love it, put 1.0, hate it, put 0.0, no extra branching. What do you say?