things being made today are a lot more complicated

There's a kernel of truth here- yes, a lot of everything is more complex (and a lot of it, like cars that now have better safety features and standards- is just better) today than it was- but that's not the whole story behind why everything is more expensive today, particularly in terms of labor's buying power.

Today, there are things that haven't improved in power or technology or quality (looking at you, broadband cable and cell phone connectivity, and basic foodstuffs, and commodities like fuel and timber, and health insurance, and housing) but cost so much more because largely none of these markets are elastic or competitive, and there's been so much 'vertical integration' in these spaces that in years past would have run afoul of basic antitrust enforcement of laws on the books.

Speaking of things that used to be illegal and still should be but aren't, stock buybacks account for a lot of money that used to go to payroll, but which now sidesteps payroll and goes directly to capital in seriously tax-privileged ways.

Basically, that means capital has been getting regular raises since the 70s but labor's rates mostly haven't kept up with inflation- and as such, ought to be regarded to be pay cuts.