If you know how to fix/repair things, you can save time and money on professionals.

Right right, but what if that wasn't the case?
What if you lived in a commune where your stuff could just get repaired at cost by professionals?
What if the time you spent trying to figure it out yourself was better allocated elsewhere?
What if the cost of repair is higher than just getting a new one?

I think it's a great idea to know stuff as well and it's totally bullshit that they don't teach sustainability in school anymore.
They want people to be dependent and living in scarcity by design... that's obviously bad.
Just saying there are a lot of things to consider.