This is actually a non-issue (or at least a minor issue for extremely long pages) on a Mac, because macOS has system-wide kinetic scrolling and all Apple input devices use touch sensitive surfaces for scrolling.

Not saying you're wrong, it's certainly annoying on mobile devices (compounded by the narrow screens and responsive content).

I use a macbook pro and this is an issue for me quite often, maybe you'll be faster but it'll still be a hassle

You can always click on the scroll bars -- invisible doesn't mean they don't exist, they simply go out of the way when they're not needed (i.e. most of the time / when not scrolling). You can do that on iOS and Android as well, tap and hold on the scroll bar to quickly scroll through an entire document.

I just tried that on Chrome on macOS and it doesn't work

It's trivially easy. Just put your mouse at the edge and move the scroll wheel. You can then click it. There is also an option in System Preferences to change this behavior and always show the scroll bars. Since this motion is more intuitive on a trackpad than on a mouse, scrollbars always show when using a mouse by default.

https://i.imgur.com/LTg81eW.png

Scroll has acceleration on macOS touchpads, doing it with two fingers is just as fast if not faster than dragging a scrollbar with the mouse.

Ah you're right, just yesterday I sprained my pinky hitting command-up and command-down!

You got me on that one!

haven't seen these keys on a keyboard in like 10 years o_O

If your keyboard doesn't have a way to send Home and End then it's broken.

How exactly is that an issue?