Boomer here. I will take apart anything and attempt either a permanent fix or a jury rig that will keep things running until I research a replacement. (I started to give some examples, but never mind. Just take my word for it. ) I do my own plumbing and electrical work.
A number of factors, however, affect how I approach a problem:
As I age, and time is more precious than money, I’m more inclined to buy a replacement part than cut/grind/drill/tap one out of the scrap metal and plastic I hoard obsessively. And now that parts for almost everything can be found online and shipped to my door in a day or two, DIY from scratch makes less sense.
Many consumer items these days are not made to repair and it’s a waste of time to try (not that I haven’t tried, and occasionally foiled Big Appliance). One advantage of years of experience is that I am fairly good at assessing what’s worth doing.
Sometimes what’s available on the market now is just better than the old stuff, like my new multi-temperature kettle that is better quality and faster than the old one that I repaired more than once.
All these considerations, more than just helplessness, may be influencing the boomers you encounter.
My daughter, a millennial, can change a tire, use power tools, cook, knit, and much more. She once complained that she couldn’t take the boys she dated seriously because “none of them can do anything”, but she has since found a young man, also a millennial, who meets her standards.
My point? I am really tired of hearing boomers this, millennials that. I’ve seen competent and incompetent individuals of all ages, and many who looked incompetent but just hadn’t lived long enough yet. There aren’t really generations, but there are different stages in anyone’s life.