I think it will matter if those project will have unique or have new idea and not just a copy right project. we encounter many scam projects in past years and non of them succeed even you read their white paper or they have great white paper they still fail at the end. so those whitepaper will matter if they are aiming to succeed and follow what is written there.
Well, it'a really difficult for them to come up with a new idea since there are already a lot of altcoins existed which has various platform and usability. Thus, this results suspected plagiarized whitepapers which disgusts the investors, causing a project to fail. For this reason, whitepaper really matters.