Especially early on, because Annihilator [a capstone talent with granting a flat bonus damage per-auto-attack] doesn't care what your weapon's attack speed is, it synergized far better with SMF [which used quicker but weaker weapons] than it did with TG [dual-wielding two-handers for stronger strikes and more stats but lower attack speed], to the point getting any sort of viability out of SMF, in balance, required that a Fury Warrior replace their main GCD (Raging Blow) with an auto-attack (Annihilator) and that they prioritize any increases to AA speed which in turn pushed them towards Dancing Blades [an AA buff] (for which they'd have to take Odyn's Fury [a short burst damage CD]) Wild Strikes [AA speed buff on crits] (which pushed them toward Thunderous Roar [a Bleed damage CD] Thunderous Words [+15% damage via all bleeds], which in turn pushed them towards any Bleed talents they could grab from Fury itself).
A huge portion of the value of Annihilator, too, especially for SMF, would also be wasted unless taking Anger Management [CD reduction to one's main buff / damage&resource CD per spender], so then you'd be building around that to the point that you could soft-cap Recklessness [said main damage&resource buff CD] uptime.
Ultimately, this meant that taking the SMF talent at all meant you were building for focus- or single-target, into a slightly dumbed down build with less burst and greater dependence on full AA uptime (and opting to be inferior in AoE despite little to no ST advantage). It also meant you were, in PvE, obliged to take...
- Wild Strikes,
- Thunderous Roar,
- Thunderous Words,
- Frenzied Flurry,
- Cold Steel Hot Blood,
- Bloodborne,
- Deft Experience,
- Storm of Swords,
- Annihilator,
- Odyn's Fury,
- Dancing Blades,
- Swift Strikes,
- Anger Management, and
- Unbridled Fury,
...and must avoid nearly an equally long list of talents...
all to make that one talent actually viable. Didn't want to play an auto-attack based Fury Warrior? Wanted competitive AoE output? Too bad; you chose the version that doesn't ridiculously attempt to strike with a poleaxe in each hand as if they were pool noodles, so you're stuck also with everything that it's balanced around.
Or heck, just take Slaughtering Strikes as an example. On one hand it could break critical PvP thresholds if allowed to stack much further on TG if paired with certain PvP talents, but it can literally cause SMF to cap out its stacks and waste its throughput it'd otherwise provide; the talent breaks on one end or the other because of its dependencies.
Aside: In fact, swapping outright to daggers, a weapon not intended for Warrior, could initially outperform Warrior weapons, SMF or otherwise, because it the continuous damage and rage generation from Annihilator could guarantee full Recklessness uptime. That much is good and fun, but...