Board Thread:League of Legends discussion/@comment-26390084-20150515162826/@comment-26390084-20150927160340

You need to consider the fact that taunts are hard CC, while slows are sof CC.

Taunts have various uses: to start a fight, to protect your allies, or to prevent enemies from escaping. Due to that fact, most taunts have rather long cooldowns, and very few champions have them (the others being Rammus and Galio).

In comparison, slows are less effective. Being able to slow the enemy does not neccessarily make them an easy target to initiate upon. Also, slowing someone may not stop them from charging towards your squishy carries, or stop them from getting away. This is because you can still use abilities and summoner spells (that Flash tho) while being slowed, whereas you cannot do the same thing while being taunted. That's why so many champions have slows, and mostly on very low cooldowns.

As for your concern, you don't need to hit multiple targets to win a team fight. Remember that Rammus with his single-target taunt can still make plays all the time. It's not about how many people you can taunt - it's about taunting the right person at the right time. For  instance, taunting the enemy carries will allow your team to take them down easily and avoid a large amount of damage during team fights. Just keep that in mind.