I wasn't even aware of multi-row tabs because I was still using Chrome, which dynamically resizes the tabs until they just show the icon, which usually is sufficient to know which tab is what. Now, in Quantum the minimum tab size is HUGE in comparison, showing the first ~5 letters. Instead of resizing smaller, I have to use click the arrows left/right which change from light gray to white (barely noticeable) when tabs are hidden. I've been using Quantum daily since the release and I'm really fighting to not switch back to Chrome (and don't even get me started about the LastPass extension bugs/missing features).