Why do people on this and similar sites always say "almost everyone ______" ???
that is really not true. It may be amongst a certain group. But that doesn't mean most of the earth's population does or owns something popular amongst techies such as us. I got into the similar argument with someone regarding sleeve tattoos and the apple watch. Yes tattoos are popular. No, not almost everyone has them.
Same here these clip on lenses are popular. No, not "almost everyone" has them.
And my question was why use these instead of a proper camera? To me it seems you are trying to get into serious picture taking with a gimmick