Tools are for fixing things...millennials don't do that.
Weird, I'm a millennial and I love to fix things. Do it 8 hours a day 5 days a week most weeks. I enjoy what I do, but I also enjoy fixing other problems outside of being an EVT. Be it a computer, a car, or even my phone. I hate paying someone else to "fix things" for me. I get the generalization, but not all of us are scared to get dirty.
Millennials don't fix things bc they're too busy trying to survive. That means overworked, underpaid, in an apartment and a throw-away car.
I'm a millennial at 31 years old, but I am lucky, unlike the large majority of my friends in that I own a house with a garage, and happen to be into 50's cars. I build and fix.
Let's not forget the huge majority of appliances, household goods, even furniture are built to be thrown away when they break. Baby boomers allowed the economy to become that I might add.
I agree that people in the Millennial bracket are probably underpaid (I am) and overworked (I'm not) but times are tough. I think its hard to categorize all people in such broad strokes. The people I know who do fix things are financially smart. They may be in debt, but they've secured a good job and house, so money isn't exactly there to pay the dealership to **** you. They've learned to do things like home renovation and car repairs on their own to minimize money going out.
The vast majority of people who don't fix things seem to not care. They think they make enough money so why fix things? Somebody else will do it if you cut a big enough check(Do people use checks anymore?

) I have friends who are 100k in debt, but make good money now so instead of being like my buddy and his wife above, they just bring the car in and pay to have it fixed.
Look at the wage stagnation for "blue collar workers" or people who would have considered a trade.
"True, adjusted for inflation, average hourly earnings of production and nonsupervisory employees in the private sector (closest approximation for the quintessential blue-collar worker that I could find) have barely changed between 1979 and 2015. In October 1979, average hourly earnings stood at $6.51 or $21.20 in 2015 dollars. In October 2015, average hourly earnings stood at $21.18 – slightly below the inflation adjusted 1979 level."
I make less than 21 dollars an hour by a fair amount. I'm making LESS than I would have in 1979... This article will show that material goods and other items you'd use in your home have fallen in price, but as you mentioned are many are throwaway items now.
"The cost of education, healthcare and housing has risen at a faster pace than total compensation"
Highlights the Millennial plight that most of my generation fell into. Material items? Good, price is cheap. Buy them all. Houses, and health care? Expensive, live at home, get sick, be poor.
https://www.cato.org/projects/humanprogress/cost-of-living