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If you dont like to play against Thresh, pick Morgana against him. Make him useless.
About Thresh poke, every time I go in and try to poke as Thresh I open my self for engages and free poke from their ADC, as Thresh's range isnt the best, but that litle poke I can do is why I favor him over Leona in laning phase, if you get behind with Leona because you're adc is too slow to engage you're screwed. Atleast with Thresh you can try to poke them down before you engage again.
And Thresh is only strong if the support knows how to land hooks.