I do fully agree with you. It's easier to delete a username. My point was for giing someone your phone number, random people don't obsess over it the way the fear is hyped up about giving someone a phone number. People freely given a phone number to a business, for people to use that number, but terried to give it to a person, that's a contradiction.
I believe hype about the fear of giving a number is a reflection of that person's social dysfunction along with callousness. If someone says they are scared to give someone on the street their phone number, whom they can block, that is a reflection of their delusional self-aggrandizing narcissism.