I think this is interesting-- are you insinuating that y rotations don't have regrips? But also, yes, a wide D move is an actual move and has the potential for a lock up while a rotation does not have the potential for a lock up. Though I think that because you don't maintain a hold onto the cube while rotating that it could potentially have a higher chance of being dropped-- but I don't think it occurs enough to warrant not using rotations.A wide d move usually involves a regrip. It has the potential to lockup or ruin the flow of a solve.
A <y> rotation only affects efficiency in semantics (and even then, a <y> rotation could contribute to movecount depending on the metric). Pragmatically, your efficiency in HTM literally doesn't matter. You still did the action, whether or not it's recorded in HTM. For this reason, as a way to more accurately describe how many moves a solve took, some other metric's have been developed, namely (at least relevant to this situation) ETM and ATM.But if you think about it efficiency wise a y Axis rotation can be the main factor.
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