Its like the low hanging fruit of engineering has been picked, or we are waiting for the next big technological breakthrough to come about. I look at even the lifestyle 30-40 years ago, and despite more efficient engines in cars (which isn't a problem with cheaper fuel anyway), the mobile phone and the internet (which isn't all good news IMO) not much has changed lifestyle wise. In some measures such as food prices, house prices, deep social connections, and other more base needs its gotten worse for the average middle class worker in a typical Western country.
IMO it feels like we've hit a stagnation which is reflected in investor preference to hoard value.