It could be argued that those modern conveniences just made it possible for both parents in a family to work. Nowadays, dual full time income is normal.
They didn't, though. What they actually did was allow your wife to have the second full-time job which is now required in order to own a home.
Still makes them a benefit to that family: if his wife was at home doing more housework the 1920s way then they wouldn't have the same house.
And, to the GPs point, they obsoleted the job of a housemaid that well-off (and even not-so-well-off) families used to employ a hundred years ago or so.