This is so true, yet people still act like Convoke has no counter.
Every class has -multiple- tools to stop the convoke. Interrupts, stuns, disorients, silences, hard ccs, and it's like the biggest prio ability that everyone just looks out for.
Sure, you'll get some good uses out of it, but it just gets shot down so easily. If someone gets hit by the full channel, they're doing it wrong.
At an organized level, especially arena, you rarely make any use out of it.