Do tenacity runes even work? Are they placebo runes?

With all the tenacity runes available, mercury treads and elixir of iron, you can get 76% tenacity. And you can get rooted / stunned by champions like Morgana, Nautilus and Veigar for approximately 2 entire seconds. Are you telling me 2 seconds is 24% of the full duration of those crowd control effects?
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