Procs aren't reliable enough for most players to strategize around so they're just a bonus. The thing with root is half the time it is nice for pallies, rangers and tanking warriors I guess but the other half it is a liability when soloing as it stops the free damage you get from flee/fear, which is a lot more inefficient than the mana you save from root. Only situations where that isn't a problem is if you planned on bow rotting, fighting undeads or areas where a fleeing mob would be detrimental as a pally, which is pretty niche.
Since you can't turn on/off the procs you have to pick if you want to carry an extra weapon or if you're ready to deal with the downsides. That's a lot more considerations than you'd want for something that you probably shouldn't have to think about especially considering there are weapons with similar ratios that are hassle free.
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