Note: I realize the tone of my writing could sound judgemental, but I'm just trying to be informative and answer the question above ♥️

Major utility/roadwork is being done. It's not just the sidewalk that's affected but also at least a lane of roadway. Likely the driveway to the road has a temporary gravel apron. Since this sidewalk has steps there's no need for temporary ADA accommodations, which the homeowner would have negotiated with the local governing body before construction began. So if they need to walk somewhere they either walk in the grass or cross the road to walk in that sidewalk, if it exists. You can see the sidewalk has been torn up along with the asphalt

There should be more and better pedestrian access in the burbs. That being said, improvements happen in public easement, and it's not always convenient. For anyone