@MerlinJStar@weirder.earth similar to your above mention, but hosting the interview in a place that isn't accessible by public transit is a big one.
Also, assumptions around internet/connectivity access, or assumptions that finding a quiet room with good internet is trivial. Relatedly, that someone has access to a room like that and that that room *looks good on camera*.
When I was interviewing, I needed a dual monitor setup to do coding interviews, but the only room with that is my bedroom. Being interviewed in my bedroom was stressful and weird, and it seemed a little unprofessional. It went fine, but it was weird.
It would be great if there were a quiet, public space with a dual monitor setup and good internet that would be appropriate to be interviewed in, but they're not very common.
A good solution might be for the employer to offer an office in a coworking space near the applicant or on a transit line, and to reserve it for an hour or two beforehand so the person can get set up and settled in first.