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I also find the super slim scrollbar difficult to use.

It is actually impossible to grab for me in Safari.

I wish frontend developers would stop messing with UI :(

Is there some browser flag that disables custom scrollbars? Surely its a problem for accessibility.

In Firefox's about:config you can set layout.css.scrollbar-width.enabled to false.

... and yet another reason to use Firefox: enthusiast support available for free ;-)