Jeroen,
First, thank you for caring and for your contributions to the Moodle community.
This morning, I realized that my reply to you could be seen as a little sharp or disrespectful. Further, I only look at a small percentage of the 2,500 article pages in Moodle Docs and those are concentrated in pages that Teachers might find useful.
I am blushing because I have seen the "I think" on pages of technical interest to developers or administrators. I do not edit those kinds of pages, the task is too much for this volunteer mortal. Thus out of sight, out of mind and my initial reaction was wrong that the "first person pronoun" was not common. My apologies.
I certainly felt (and still do) the same way as you about Moodle documentation when I joined the community. Helen Foster encouraged me to make thoughful edits. From a personal standpoint, the collaborative documentation process has really taught me a lot about different communication styles and I highly recommend it.
Best Chris