Are you looking at the newest creatures for your examples, or the oldest ones?
All I do is try to bootstrap something before creating anything new. If I find multiple copies of the same ability, then to save myself the time of comparing each one I just create a New (Copy) and continue the trend. I hadn't noticed that you were switching to using common abilities instead of individual copies, so I will change my habits accordingly.
Do we have a list we can refer to of which abilities are being used as universal, or are we just referring to what are defined in the Bestiaries? I notice there are multiple copies of things like Blood Drain, Darkness, Disease, Energy Drain, Fear Aura, the list goes on. I'm sure not all of these can be used universally and require unique versions, but it would save me time and help me to stop re-creating when I don't need to if I knew what I should be able to use as is.