Honestly, not always. What I mean is, sometimes a project's whitepaper is made very complicated, and the explanation is not easy to understand. Personally, I usually only read the points that are most important for me to understand.
I know this is not right because it is still very risky for us to get scammed. However, it is indeed that boring to read the whitepaper. Especially one that is only made in detailed details without many illustrations, it will be very boring.
Yes, although it should and ideally, we should read it in great detail and carefully so that we really understand the meaning of what is written in the WP. However, it is indeed not easy.