Well, I do get essentially the same thing using a mouse pad and chiral scrolling if and only if I scroll back up from a spot further down the page. I seldom do this, though not never.
My laptop is hooked up to an external monitor and itself is sitting on a laptop tray mounted to a monitor arm, so I don't really actively use the trackpad for it. I use an external keyboard and mouse.
Even when I'm using a scroll-wheel mouse, I am not a fan of what's commonly referred to as coasting and don't turn that on. My equivalent of a "fling" such as you use is a single tap of the home key.
My mouse does not have a true "coast" mode (i.e. where you can turn off the "click" aspect and having it roll with momentum), but I can get some of that effect due to the scrolling speed I have set for it in the settings. I rather like my mouse as I specifically found one that has about 10 or so buttons that I can then assign to various functions in the macOS (yes, Macs can use mice with more than one button
) by way of a third party driver program. It allows me to switch virtual screens, go to Mission Control, use back page/forward page, and other things without my hand needing to leave the mouse.
It's interesting to see how many ways that different people have of accomplishing exactly the same result and, often, the exact method that they use is what triggers certain features that drive them crazy as a result. As a general rule I'm one of those folks who, when this occurs, tries to figure out what's causing it and then working around using whatever action or actions trigger it, substituting something else that achieves the same effect.
But, like I said earlier, I have nothing against the static header and, the more I think about it, believe I would prefer it. I really like "knowing where things are" rather than having them "follow me."
I am still largely of the camp of "it does mot matter to me". That might change if I actively ventured out of the forums much and read stuff on the main/news pages. But, even then, I cannot say until I actually did. I might be fine with how it is...or it might annoy me. I cannot really say until I actually regularly encountered it. For the most part, I am pretty easy going and can live with most things or if not maybe find away around it. There are, however, on occasion, some things that will really annoy me. If that happens, I usually try to find my own fix or way around the annoyance as typically it is too much hassle with little to no reward to complain and hope someone else changes things. If I cannot find my own fix or way around, then I will then typically speak up in the hope that I can get something changed.