Let me tell you a secret. Not all shares provide a right to vote.  Sometimes you won't even be able to purchase those coontroll shares. The board of directors determine the company's future. They may decide to pay you more dividends or to waste those money on something that no one needs. You are still not guaranteed to me the main guy in the company.
What about tokens. First of all it is not the fault of ERC-20, you can make your tokens on the other platform. Also ICO is a mix of croudfunding and actual investind. Most ICOs even issue their tokens as a currency for their project. In such cases no one even claims that it should give you any ownership rights for the product.
But it is still obvious that investors want to feel safer. Pretty often the people that rise huge money on ICOs don't even know how to manage his new company and lose much money only because of poor management.
This is not the fault of the token standart. The only thing that  I see for now is to issue  some kind of reputable organisation (that's just my thoughts, I have no idea how it could be reputable from the very begining) that will make something like a private certificate that could be achieved after the deep analysis (maybe that will make ICOs to make better whitepapers). I'm still not sure how it will work but there is no better way.