Yeah it’s nice that you’re so considerate and it’s definitely not unappreciated, but you’re certainly in a small minority of cyclists in wanting those behaviors to be the norm. I’m confident that most cyclists consider those to generally be car behaviors and unless you’re in close quarters with another cyclist or around cars, they’re never really required and absolutely not expected. There is no world in which I’m going to want or expect other cyclists to be making hand signals meant to get the attention of drivers every time they need to make a turn, and so long as I’m not in a very tight spot on the path I’d rather that other cyclists pass me without having to make a ritual of it. Yours is definitely not an axe that most of us want to grind. Just so you’re aware.