Can someone explain me why 25% attack speed are more important than surviving?

As an Irelia main I'm facing a lot of hate towards the 2 second stun from ADCs. What I don't understand is why they don't just buy Merc Treads? 35% Tenacity would lower the stun duration down to about 1.3 seconds and in lategame it's even somewhat a challenge to burst them down in the 2 second stun. I just don't understand this logic, do 25% attack speed really do that much of a difference DPS whise?
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