Sorry, it was a suggestion, I get that. Edited my post.
Yeah, I don’t mind Arty getting an extra 25 SoA. Just that it doesn’t make sense if the other Protoss CO’s don’t also get that. The only Protoss CO’s that don’t have initial SoA mastery are those that don’t use SoA at all (Alarak, Fenix, Zeratul).
You’re right, it’s possibly also an easy fix. (I don’t like the part that it has implications beyond just that extra 25 SoA, as per my reply to Cerebrate.)
(This Prestige needs rework anyway.)
Yeah, the 2nd part of that statement which appeared in your edit is where all the problems are 
Coz after lvl 15, that first Pylon is usually heavily delayed. Possibly only at 3-4 minutes or so.