Well, I do not fully agree. The relationship startup-founder-investor has to do a lot with role, expectation and respect. If an investor feels the need to interfere in business decisions, then she/he should have a good reason for it. Mainly an investor invests into the team and trusts the leading people - that is why she/he invested. If success and return of invest do not come as planned, there is more to worry about but to lose or share power. If a founder wants do do his/her own stuff without anyone around to provide advise, to point out issues or to be critical, then you should not start a business at all. Others will depend on you and it is not a one-wo/man-show. Never has been and never will be. Become artist, author or potus if you really think so. But if you get invested, check the contract you sign. Make sure you don't sell cheap and get to know, whom you let become part of your company. An elevator- pitch is not the kind of date that shows whom you are talking to.