Missing arrows in the scroll bars

What type of pointing device are you using? A mouse, trackpad, stylus, trackpoint, trackball, or other?

The reason for the question is that scroll bars and their arrows are less commonly used today, because many people find that it’s much easier and faster to scroll using a trackpad gesture or the scroll wheel on a mouse. I’m just curious if there is a reason that you prefer the scroll bar or its arrows over the newer methods.

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LR scroll bars have never had up and down arrows (at least since LR 3).  But if you click or click and hold at any spot above or below the grey rectangle, it behaves the same as if it had arrows:

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There are no arrows in my copy of LrC version 10 on Windows 10.

I never use arrows for scrolling, so I can't say whether this is something new.

For all I know, it may have been like this since Lightroom 1.