Why doesn’t the universalCamera have an upperBetaLimit method similar to ArcRotateCamera
First of all, because it has no Beta 
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The universal camera is like FreeCamera an FPS like camera driven by position and direction unlike our ArcRotateCamera aka orbit camera which is controlled by a target and the alpha or azimuth and elevation or beta so as @labris mentioned, the UniveralCamera having no beta does not need a beta limit.
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hahaha. Short but efficient 
Ya don’t take any detours, do you? 
Edit: I’m gonna upvote @sebavan 's more ‘diplomatic’ answer though, if you don’t mind? 
. Not all of us are specialists for the various types of camera 