Is mac's Invisible scroll a good UX? [duplicate]

1. Why does Mac hide scrollbars?
2. Are scroll bars necessary?
3. What is the benefit of scrollbar?
4. Why hide scrollbars?

Why does Mac hide scrollbars?

A. In an attempt to streamline the user interface, Apple's Safari browser for the Mac has scroll bars that can disappear from view if you are not actively scrolling through a web page.

Are scroll bars necessary?

A scrollbar is needed in instances where there are a lot of items in a dropdown menu. The general rule is that only 6 to 10 items should be visible in the dropdown.

What is the benefit of scrollbar?

A horizontal scroll bar enables the user to scroll the content of a window to the left or right. A vertical scroll bar enables the user to scroll the content up or down.

Why hide scrollbars?

Reasons to hide the scrollbar

Hiding the scrollbar will create a smoother scrolling experience and remove some distractions from your site's overall layout.