I'm deaf and there have always been badges available to let people know that you are a lip-reader. (otherwise the assumption can be that you are just rude). I have never heard it advocated that everyone should wear a badge saying " please look at me when you speak, I may be a lipreader" although there are 12 million people with significant hearing loss in the UK (RNID 2020) who would benefit from this consideration by others. Hearing loss can't be the only example, if we have badges for every consideration that we could take into account when meeting a stranger, there is going to be a new societal norm of 3 minutes' silence when you meet a new person, to read all their badges. It would be a strange world.