Whitepaper and road mad are nice and good things for a project. They tell you what is to be expected of in project especially if you are an investor. But then scam issues sprung up, recognizing the power and influence of whitepaper and road, came in and capitalised on it to defraud a lot of investors
And now it becomes difficult to trust whitepaper and road map, but it wasn't like that from the beginning.
The solution I presume now; lets take whitepaper to tell us what the project devs aim to achieve; dont use whitepaper as a reason for investment.
White paper is just a declaration of intent of the project developers. The roadmap is an approximate timeline for the implementation of the planned stages of the project.
As my experience shows, these documents are, as a rule, followed and executed rarely and changes are often made there.