Currently in Obsidian, you have to position your cursor at the correct height to hit a tab, which takes some precision.
Every browser or other tab-based app that I’ve used is set up so that moving your mouse to the top edge of the screen still allows you to click on the tab in that position. This way it’s possible to just move the cursor as far up as it goes and click, making switching or rearranging tabs a lot easier.
If this change was to be implemented, it’s worth noting that it would leave relatively little space to grab the window itself when a lot of tabs are opened at once (about a third of the space Chrome or Firefox would leave). However, this could be fixed by forcing that gap to stay at an acceptable width at all times.