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Tech's used to be these very gimmicky pairs that didn't really have any value. As time went on we got grids and now they're super fucking good.
Like look at P.Serena, why would I use Diantha over her? The former can paralyze, give the team max speed, better speed stat, better bulk, can debuff, and has a monster sync nuke. Diantha just has better self buff's and has better crowd control for FF and MM.