Rider switch being the alternative to DAS would be a deterrent for anyone who doesn’t truly need the accommodations. It’s difficult to use it to gain anything over a guest without accommodations since it forces the party through the attraction twice. I would assume people would not be using it as a precaution in the same way they use DAS, and instead would attempt the line first or buy Genie. It would both eliminate some of the overuse brought on by people who legitimately qualified but don’t need to use it all the time, as well as discourage people who lie to get it as there’s much less to gain.
You can technically use it like DAS to be in two places at once, but the “fee” to do so is higher. Someone in your group now needs to physically be in that line.