Well, I strongly disagree with their opinion on this. This is one of my top 3 pet peeves about Windows UI design these days. The other two are failing to make it obvious which window is the active window, and cluttering up the title bar with crap like tabs.
USE this link->> <a href="https://answers.microsoft.com/en-us/windows/forum/all/why-is-the-scroll-bar-in-windows-11-so-narrow-in/32a233d3-8453-4ee9-85c3-ba1a55a63dc3" rel="nofollow">https://answers.microsoft.com/en-us/windows/forum/all/why-is...</a> the horrible URL that was pasted for no reason other than Chrome/Microsoft creating this monstrous URL and the main link doesn't work? I have to always double check the URL whenever this happens but it happens so often that I missed it. Sorry!
It's maybe worse here: In macOS I don't see the scroll bars most of time (they only appear on scrolling) and they are narrow (so I need to scroll and then grab them quickly). I can imagine that inspired Microsoft.
It also suggests that most mice have the option to scroll without the wheel. But this still fails. And Discord has a dark background with a THIN scroll bar, making the problem even harder.