Alright, thanks for all the help and advice!

I'm not the one who mapped out these blue paths, they were already there previously. In WA, cyclists can ride on the footpaths even if they don't have the bicycle symbol. Would it be worth changing them to normal footpaths with bicycle=yes instead of bicycle=designated because a lot of the blue paths in the area are actually just regular footpaths and do not have any markings.

Thanks for that, new mapper here. Should refuge islands always be marked by a separate feature? When is it ok/preferred to use crossing:island=yes? Also I should note that the two shared paths do not have the bike/pedestrian markings and are the regular concrete/tiled paths.