Many websites don’t bother to fix this thing which significantly improves the UX when browsing websites on small screens (smartphones, etc.). Overflows cause the webpage to drift when attempting to scroll down, and it can be a frustrating experience (at least, for me, especially when I have to re-adjust because the initial size of the text is small because somewhere down the page there is a long string of monospace text or code piece in a <pre> tag).
I second that monitor setup is a personal preference. Personally, I prefer alt+tabbing (repeatedly) over using multiple monitors. No need to rotate my head, to seek with my eyes. My colleagues seem to prefer using multiple monitors. One colleague has an ultra-wide. For me. a single 1440p is best.
Huge screen and DevTools being docked (either left or right). I am currently on a laptop, there’s no other choice than to alt-tab. If it’s a small desktop screen, then having a second monitor would be nice, but then if already got used to alt-tabbing, second monitor would be useful for some white noise TV. I once tried that dual screen setup, and the second monitor was small, and using it as DevTools was not that bad. But huge screen would’ve been better.