Yes in that society it was dishonourable to go out unless there was an urgent cause, as it was a man’s world. In today’s society it is arguably dishonour able to make women stay inside with no good use of her time. Especially as women are expected to be seen out and about. Even if you would argue she shouldn’t be out without cause, there are many causes today that warrant her going out on a day to day basis so there’s no argument there.
Regarding Sara Imeinu that was in her home (maybe a separate tent) the equivalent today would be not walking into a mans shiur being hosted in your living room and yes tznius women stay out of mens sections etc.