It's so easy to wrongly screen out senior devs for the reasons you mention. I've seen JR devs want to ask tricky algorithm questions, because that's still fresh in their minds from school... I've seen mid level devs ask the framework gotchas because that's the world they're in...

Coders have misconstrued fizzbuzz into a whiteboard pissing contest because they want a binary yes/no interview framework... But that causes them to miss the forest for all the trees.