If only it were so easy.

Suppose you came up with a brilliant and original idea but it would cost £1m to build the prototype. You don't have the money and can't patent your idea without the prototype. So you ask me to help you because I do have the money but I take the prototype to the patent office and register it as my own idea and nothing to do with you. You have some nice drawings and a few pages of text from several years before but no prototype so the patent and any money to be made from the idea is all mine and you get nothing. Your "fix" completely negates what patents are for.

(no I don't have millions, it's just a hypothetical)