Actually, I am sorta glad they did wait this long. Now we don't have a bunch of ****ty versions of Lynels cluttering up the more mediocre titles in the franchise.
I love their colors, their design, their difficulty, and I especially love the way they fight. Going up against one just feels like such an epic clash. In fact, I never actually initiate combat with them at range or by any cowardly means. I get out the weapons I'm gonna use in the fight, then...