Maybe I'm missing something, but it seems like it's perfectly possible to be interested in something and yet still have a lot of experience in the subject matte

Maybe I'm missing something, but it seems like it's perfectly possible to be interested in something and yet still have a lot of experience in the subject matter. Lots of experts want to share their knowledge either to help the field move along a bit or to get more people interested in whatever their expertise is in. The person on YouTube that makes tons of videos about the minute technical details of Super Mario 64 and talks about half button presses and parallel universes is obviously highly interested in the game and its mechanics and also has a lot of experience with it. There are people whose main passion remains the same for 20+ years and who never get bored of learning more and more about the same subject till they retire or die. And no, I don't think objectivity must be passionless or bore the reader. It's possible to present 'just the facts' in a way that's enjoyable to read and doesn't try and pass off any viewpoints as objective. A good nature documentary could still be interesting to watch after all.