When I did traditional style TBar Rows, BB Rows, and rack deads I could handle tremendous load, but my back got nowhere. My lats were hot garbage. Erectors were great, but that’s not what makes a wide back.
When I slowed the negative down, I felt as if my biceps were doing way too much of the work to reduce the speed. TBar Rows inherently suck for arm positioning (angle is too acute at the top) and they also stress your erectors/discs unnecessarily. Carrying the load stretched out in front of you like that limits the load your lats can control.
A fully lengthened (but not overly stretched) arm position allows the lats to move the shoulders first, then the arms follow. A controlled descent is better than a fast drop or a slow neg. If you release it too slowly, your arms tighten and take over more so than the lat.
If I’m trying to bias lats for rows, nothing beats DB rows face down on a low incline bench. Takes the ego right out of it.