what happened to the scroll bars?

Apple has gone and made yet another infuriating change to one of their crucial applications, i.e., Finder. They have changed it so that you do not see the scroll bar at the right edge except when you first open the window or move the right edge, or scroll with the mouse. Then and only then do you even see the scroll bar. The did the same thing with the Preview, and here it is perfectly obvious that this is a really dumb idea. You have a vertical colum of icons on the left, and a picture on the right. If you set your mouse scrolling to work well for one, it does not work at all well for the other. This is a fact. Reliance on the scroll wheel just doesn't work. They perhaps thought that everyone should be using their mice with touch sensitive surface. Perhaps there isn't a problem in that case, but it isn't an excuse, because not everyon likes the Apple mice. I don't like them at all. One of them has sharp edges, and there is something else wrong with the other one. I use only generic mice, and see no reason not to. AND, I am incensed at them once again for doing something that is just plain idiotic. I reiterate: it is just plain idiotic for them to have done this, and this is exactly the sort of thing that Apple does as a matter of recourse. They have got the idea in their collective mind that their purpose in life is to dictate to everyone else how to interact with a computer. It is an extraordinary degree of hubris, far beyond what I can tolerate. APPLE, PUT THE ****** SCROLL BARS BACK, YOU HORSE'S *****!!!!!!!!!!!!!!!!!!!!!!!!!!!