I have to disagree! I simply do not understand what useful purpose it serves—IF we are allowed to assume that our readers have a proficient level of prose literacy. The default assumption, when someone is talking or writing, is that they are communicating their own opinions and thoughts, experiences, anecdotes.
I don’t know about you, but when I think back to taking writing classes in school, if I wrote something like “I've seen this tendency in multiple teams I've been part of” in my paper, any good writing teacher I’ve ever had would cross it out. Same as “it is my opinion that” or “I have recently started to form some beliefs in the matter at hand after reviewing some materials that came into my possession” or other… filler. It pads out the document and only tells us things that we should already know, or be able to figure out.
The ability to sort out opinions and anecdotes from factual claims and evidence is… well… something you’d expect from a proficient reader!