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Do You think that is mainly due to fact :
1) steel expanders don´t provide option of this excercise (without attaching one handle to door handle or some anchor which provide this possibility) opposed to rubber tubing, where one could bend tube over feet or different point and perform rowing motion, so it is for simplicity.
2) it wasn´t well known excercise back in expander courses prime (I suppose oldtime strongmans don´t look into workout schemes as divided to verticall pull/push, horizontal pull/push, rotation and core but worked overall strength, movements or specializations).
3) there are better/other excercises with expanders for same targeted parts (I suppose combo of Front chest pull, Archer´s pull and ODP targets same body parts as for example Seated expander rows?), so rowing is only another possibility to add into already overall classic expander horizontal pull excercises.
Mostly... I´m interested here in question if classic expander excercises are all that one needs for back health in terms of provided horizontal pulling motion (if really Rows are only addition)?