The argument of people being ‘better off’ now is that technology is better and more available. It is much cheaper to buy a big 4k flat panel tv now than a black and white tv with four channels and no remote back in the 50s. We have the Internet, smartphones, better health care, video games, music, streaming services, cheap air travel, food from all over the world, robot vacuum cleaners, air conditioning etc. etc.
What we don’t have so much of is cheap housing, good secure jobs, any reasonable degree of income equality etc.