The only way they can hold you is when they are in melee range.
So, what to do? Stay out of melee range.
Once you are in attack range - fire. Got rooted? Continue shooting. Not rooted anymore? Retreat a few meters. Continue shooting. Got rooted? Continue shooting. Not rooted anymore? Retreat a few meters. Continue shooting.
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Hopefully one day they will. But for now every STF's theme is a million of enemies to steamroll your group in 3 seconds.
So, what to do? Stay out of melee range.
Once you are in attack range - fire. Got rooted? Continue shooting. Not rooted anymore? Retreat a few meters. Continue shooting. Got rooted? Continue shooting. Not rooted anymore? Retreat a few meters. Continue shooting.
Tada.