Because most people don't know what visionary means.
vi·sion·ar·y [vizh-uh-ner-ee] Show IPA adjective, noun, plural -ar·ies.
adjective
1.given to or characterized by fanciful, not presently workable, or unpractical ideas, views, or schemes: a visionary enthusiast.
2.given to or concerned with seeing visions.
3.belonging to or seen in a vision.
4.unreal; imaginary: visionary evils.
5.purely idealistic or speculative; impractical; unrealizable: a visionary scheme.
But you didn't use the term correctly either, plus he was a brilliant and revolutionary thinker. He took small ideas and made them huge.