Actually there are better ironers out there for home use than Miele, Pfaff for instance. Take a peek around some European eBay sites like eBay Germany to see what can be had, both new and vintage in terms of ironers.
Just my two pence, many aren't thrilled with the 120v Miele ironer, mainly because it seems not to get hot enough to do the job in one pass on certian items. IIRC, the older 220v Miele ironers were hotter.
Those Simplex ironers, and others were the first smaller ironers introduced not only for commercial laundries, but for home use as well. You can see old adverts for them on eBay all the time.
Then as now the pitch was to save Madame (or more likely her maid or launderess), time and work when it came to laundry day. Remember right up until the 1940's or so there was LOTS of laundry that had to be ironed. More so around the turn of the century when not only household flatwork (bed and table linens), had to be ironed, but most everything else that was washed, from undergarments to shirts/blouses, children's clothing and so forth.
There was also a growing movement towards doing laundry at home, which started around the 1900's or so, and grew as more and more labour saving wash day devices came into being. Simply put many were not happy with the results when their laundry was sent out, there was also theft, loss, and mixing up of items. Finally there was the very real danger of disease being transmitted by the mixing of one's laundry with god only know's how many other hundreds of persons.
Illness could not only go out on soiled linen, but come back into the home if the "clean" linen was not handled properly and came into contact with soiled and germ laden linen. This is of course if the job was done correctly from the start.