Yes, but it shouldn't be invasive.
A rotation helper simply requires a lot of maintenance, between class changes, legendaries, talents, etc.. it's a damn big hassle to properly maintain it, disregarding it how bad it would look if the communtiy figures out that the builtin rotation helper suggests something incorrect.
I think however that there needs to be something that helps new players to teach the basics, the jump from *playing WoW* to *playing WoW properly* is massive.
Already telling players that something such as "Focus Target" exists alongside macros / option to to target your focus with certain abilities without having them as your maintarget would go a long way.
Stuff like Mouseover macros is something you don't learn by just playing the game, despite them being utterly powerful, especially for healers.
I don't even want to know how many healers are still selecting their target manually and then heal them rather mouseover in their party / raidframe.
Blizzard should absolutely consider something akin to "how to basic" guide that frankly teaches players what sort of options exist for players to use, outside of the regular "select target, press keybind" functions.