You really don't need to use macros or JAs to do the 6 step requirement on SAM.
Of course you don't. If you have sufficient gear, capped magic haste, and COR buffs, just about any melee job can possibly pull it off without JAs or macros. But the purpose of these macros is to do it with
zero support, and a modest gear requirement, for which you do need to use certain job abilities in a certain order with a certain timing. If the Skillchainer doesn't have to rely on other players, then there are less variables involved, so it should be more consistant.
There are other methods certainly, but I found this to be quite consistent without any support whatsoever.