I think you're overcomplicating things. Transit maps are meant to provide a general overview of routes, not nitpick every detail about bike lanes. If you're expecting maps to distinguish between lanes with physical barriers and painted lines, you're setting yourself up for disappointment. Newsflash: most maps aren't that granular.
As for indicators of bike-friendliness, it's not rocket science. Look for dedicated bike lanes, traffic volume, and road conditions. If you're still unsure, use your common sense. And what's with the obsession over transit map features and symbols? It's a map, not a cycling manual. If you can't figure out how to navigate a route safely, maybe you shouldn't be cycling in the first place.