You will not get the most out of your SMN with macros. That's all there is to it. Yeah they're great to tie embrace to your physicks and such but it just doesn't work that way for SMN. Your Egi will always hit the enemy you tell them to and just clicking obey with a different target is all you need to make them switch. You can still have them use any other skill on something you're targetting even if it's not their target.

Macros round up to the nearest second and are not the fastest at going off anyway. Every single 2.5 wait becomes a 3s wait and macros are not adept at using off-GCD moves when you're on CD. I can Swiftcast shadow flare and pop rouse and spur just in time to start casting ruin as my GCD comes off, a macro could never do that.