Also, they might change their current health benefits as those are often priced & administered according specific geographic regions. Maybe not a big deal between MA/NH but certainly if you switched to remote only from a little farther afield.
The health benefits already have to be set up to account for where the employees actually live rather than where we work on paper. E.g. if an employee lives in New Jersey and commutes into New York, either the health insurance has to cover providers in New Jersey or the employee has to see doctors in New York. It doesn’t solve anything to change an entry in a database and pretend the employee is actually somewhere else.