LOL...that's a sales pitch.
I disagree...
Changes in design have allowed for much more useable space, and better unit layouts. This is seen with less hallway space, and more efficient technologies within the units.
For example:
(i) My washer/dryer is a two-in-one, with no need for venting;
(ii) My dish-washer is TINY and compact, thus taking up less room;
(iii) Unless you are in luxury, kitchen space now takes up much less room, and with the open concept, makes for much larger entertaining spaces; and,
(iv) etc...etc..
In fact, two years ago I was on a tour of condos in the UK, and I was blown away by a few 300SF suites that seemed to be extremely spacious due to their design. In fact, the entire kitchen space was hidden in closets, and with the switch of a button the wall separating the living from the bedroom turned sideways (similar to The Hudson's common ammenity party room) thus either hiding the bedroom or opening it up (the bedroom had a murphy-bed, and doubled as a cool den.
New designs and technologies have made for very efficient and comfortable small spaces.