Honestly after rereading them I actually question the way a few of them are worded. Zirda, the Dawnwaker should probably say all instead of EACH because we know all includes 0, each is not as explicit. I realize we use them the way we use them because WOTC can just say by edict that it works this way, but the templating seems sloppy to me.
I would say that if Zirda said "All" instead of "Each," that would be ambiguous because it could imply that all cards would have the same activated ability. The use of "each" implies that for each permanent card in your deck, they each have their own activated ability.
If the templating were instead "All permanent cards in your starting deck each have their own activated ability," that would be redundant. The templating, as worded, uses "each" to save space and use fewer words on the card
I used to work in publishing, and it always boiled down ensuring the typesetting and format of a page not only made sense, but looked "as clean as possible."