I have no problem shattering phantasms for utility. However the current way phantasms and shatters work is shit. It is now use phantasms on cd's and if you have a phantasms out its better then mind wreck damage unless the target is low health and phantasms attack isn't about to come off cd.
And no they don't need to nerf phantasms because you can have a phantasms up 24/7 NOW as long as it doesn't die however you are sacrificing a clone spot which is actually stupid. In fact you can have 3 up if a mob lives long enough so yea its a small indirect nerf to phantasms builds but does the current design work, hell no.
My idea would promote phantasm usage when you need it and not on cd, give scepter an indirect buff by making its clones more useful, give shattering a buff because now phantasms are not tied with shatters so now shatters builds will be efficient. All at the cost of not having the potential of 3 phantasms up at one time. Now its limited to 2.
Sorry I don't see your point.