From the written testimony of Peggy Murphy for the National Council of Social Security Management Associations (NCSSMA) to the House Social Security Subcommittee:
... Field offices can be more responsive to the public only when employees are onsite. The current telework program in field offices makes it difficult to adjust to surges in office visitors or telephone calls while balancing appointments, scheduled and unscheduled employee leave, and back-end work. This is further complicated by having an appreciable number of field office employees continuing to work from home full-time due to personal circumstances. SSA has the technology and flexibility to consider transferring field office employees, who are unable to work in the office, to other components that can better accommodate their telework needs and limit the impact on front-line public service. We need employees in field offices who are able to work onsite and assist those who seek our help in person and to handle the multitude of workloads that are not portable. As an agency we need to be able to maintain our flexibility in the field offices so we can respond to surges from the public.
By the way, Murphy's written testimony says that Social Security ought to accept electronic signatures. Per a White House order, they must! Social Security is mentioned by name in that order. Grace Kim, Social Security's Deputy Commissioner for Operations, also testified that the agency couldn't yet accept electronic signatures. I don't understand this.