Whitepaper is very important so this is the goal of their project so it will be written on the whitepaper so everyone will know about this project actually, but sometimes we have to be careful now that many projects are plagiarizing their whitepaper so they steal concepts from other projects.
Yes, some scams just copy paste whitepaper from other projects, they don't even bother to change it a bit. Wp should contain everything about the project, from the team members, the project ideas, their plans, road maps, and everything connected with the project itself. Good Wp means a lot, but it's just a beginning, the team should be able to follow their plans, to struggle with problems, to face with many users and their problems, you really need to have a good team capable for all that. Without good team, awesome community Wp doesn't worth much.