What folks need to understand is that this statement can be largely correct, but that behavior still not be a great choice. This habit of not explicitly stating it, and relying on folks to assume it, still probably contributes to most of the arguments on the site.
You see, even if most of the folks on the site either understand it is a statement of opinion, or don't care to argue, that most is not all. So, there are some who take you at the explicit word you wrote, and will argue the point. That is not "most" people, but it is enough to cause disruption and have someone like me have to come in with red text.
Lacing your posts with phrases like "in my opinion" (or "for my group", "it seems to me", "imho", or "your mileage may vary", etc.) that make it explicit that you are limiting the scope of your assertions is like wearing a mask in public during the pandemic. "Most" people are safe, but the few that are not are still going to be a significant problem such that it is worth protecting yourself.
In addition, while you may be cool, other people do intend their statements as fact, not personal opinion, and you are now actively choosing to leave your posts looking like theirs. I am glad if that's worked out for you, but it may not be the wisest choice you can make.