Is rebuilding the system image necessary?

I remember reading this blog post by @ChrisRackauckas a while ago. ‘Gotcha #7’ mentions rebuilding the system image so that you get hardware specific optimisations. Is this still necessary?

I’m using JuliaPro in case it’s relevant.

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My understanding is that it is probably not necessary anymore for 0.7, but I find the docs a bit hard to read: