Yes, it was an illusion of choice.
That does not mean it was pointless. First off I know plenty of hordies that complained they had to sit by and watch while Garrosh went on his crusade with no choice in the matter. Likely this was mere fluff content to appease those players, give the illusion you can reject her while still remaining loyal to the Horde.
It can also be seen as the inevitable result of siding with the Horde in general. The Alliance has always been the "flawed hero" faction, absolutely the "good guys" in this story with nuanced "evil" elements to keep it interesting. The Horde has always been the opposite, the "flawed villain" faction. Absoluetly the Horde are the "bad guys" in this story with nuanced "good" elements to keep it interesting. This is seen in Thralls failure as warchief, no redemption happened, the only time the Horde was relativly "peaceful" was when Thrall forced them to be. BFA has taken it a step further in giving hordies the illusion of choice, see you're not really a bad guy, except at the end of the day no matter your "choice", you are still supporting and siding with the bad guys.