Aldarc
Legend
One thing I often see talked about amongst TTRPG designers is that many TTRPGs are terrible at teaching people how to play the game. There is a difference between being a good game designer and a good technical writer/instructor who knows how to effectively teach people how to play the game. As you say, @AnotherGuy, a lot of "best play" practice when it comes to our hobby comes indirectly from others rather than from the game books. Designers are clearly working on improving this art, but for everyone who learns, there are many more who have yet to learn.