Hello Kaartic,

I understand the impact of the other two maintenance operations. I'm a
little confused about this one. You initially say this affects some
wikis and give a list. But in the end you say, "This will affect all
wikis". IIUC, you intend to say that as CentralAuth-based services are
affected the impact might be (indirectly) observed on all wikis. Is
that correct?
Yes, I think that you're right.

Best regards, 
Zoran Dori
volunteerWikimedia Serbia
s: zoranzoki21.github.io e: zorandori4444@gmail.com