Main issue with Strid I've found is that she's typically targetting and debuffing the enemy heavy tank while that enemy tank destroyer or arty remains far behind it and not getting debuffed.

I've found Strid more useful for debuffing enemy commanders' accuracy (shred and Strid's debuff do work on enemy commanders). Especially those damn abyss crystals that take forever to die and thus having them be debuffed for the duration of their freakishly long life is very nice. Also nice vs Siegfried where the most threatening (the only threatening) thing about her is her DPS.