Perhaps most content writers opt to play it safe thinking their personal experience is not a one-size-fits-all and end up with a fuzzy picture trying to just share basic rules and principles.
This is absolutely true, however, the most usable knowledge are the knowledge we find very common, however, not having them at all can be detrimental to our learning process. I think I learnt from some of the most ordinary things of life and we cannot completely sell knowledge in a raw form because people have different mental capacities and I guess from a teacher's in perspective, this feels relatable. So if knowledge is not relevant I don't consider it's Importance. So knowledge to me is important based on the impact and usability and not some old principles. Knowledge becomes obsolete with time and hence we have to replace them. However the varoius experiences we have is evergreen and inasmuch it might not feel special to us, there are people who would want to learn from them.
Thanks for the amazing comment