Why can't the blades be broken down into managable segments and assembled on-site? The military folds and unfolds airplane wings all the time on aircraft carriers.
(It's an honest question; you must have thought of it, of course.)
(It's an honest question; you must have thought of it, of course.)
I'm not saying you are wrong, but by themselves those factors aren't entirely convincing to me.
(Also, the wings need to fold and unfold repeatedly over their lifetime; the blades could just be, in theory, shipped in pieces and then assembled once).