That’s a very bold statement. 
And, of course, somewhat subjective, too.
It didn’t technically ‘steal’ them — it copied. Rogue, if memory serves, had some tricks like this, too.
Actually, I’ve heard they’ve gone against everything the game design stood for previously with this — not even Ben Brode, (in)famous for his maniacal bellowing laughter (‘BWAHAHA!’) and design solutions consistent with this kind of behaviour (yeah, I’m self-plagiarising here a bit), would implement such things (messing with cards in your opponent’s hand and so on) back then, because they wouldn’t be considered fun. I believe Old Guardian had a detailed video about it (the game design), those interested could watch it.