Mobility has use in pvp by making you walk almost as fast as you can sprint meaning you can essentially shoot and run and peakshoot better. 99% of your super is gained from dealing damage intellect generally only gives your super like a 10 second faster cooldown by the end unless you do no damage.
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Intellect definitely makes a noticeable on well and bubble. Which is why they need to get rid of the stupid super tiers already.