It is important to know that for any project hoping to convince investors into putting their money into the project, they are going to be focused on making the project as appealing as possible which means that the project's whitepaper will surely be good so I believe you should look beyond the projects whitepaper to decide if a project is legit or not.
Always make through research of a project's team, road map and token metrics to decide which projects to invest in
Scam projects or Legitimate ones will definitely make their whitepaper to be appealing and convincing as they can because this is the most common spot for most investors to be checked
but talking about always trust then it shouldnt really be always a basis where if you do find out that they have a good whitepaper you decide to invest. Its definitely a common mistake and the reason
why most people do fall into scam project knowing that scammers are getting smarter yet they do already know that WP is the main thing been checked therefore they would need to focus on doing it realistic.