Yeah.. morphs are a direct line.. point A to point B But with wings in particular, there's a curved motion in opening and closing them.

You could create 5 or 6 static wing position morphs, but if someone tried to animate them, they'd be stuck. (Been there, done that, thinking I could save work.. I ended up trashing all the morphs once I had proper rigging in place.)

Best dragon wings are on (in no order) daz dragons, majestic dragon, and the daz wyvern 2.0.
best bird wings are EtuJedi's over at Rawart.

Way too many people take way too many things way too seriously.