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There really isnt much reason for IVs to exist. They make the game unnecessarily convoluted.
I kinda like being able to pick and choose what my pokemon outspeed on my trick room teams, but that's just me.
In the game as it is, most Trick Room Pokemon will be running 0 speed and a speed-lowering nature. In a hypothetical IV-less world, what outslows what wouldn't change dramatically, since most TR Pokemon would still run Speed-lowering natures anyway.
Unless there's some advantage to being slower than some, and faster than others.