I don't agree with that. I prefer the x in the tab as it makes more sense to me. It makes it directly obvious to me that it will close the selected tab. The x in to top right corner to me means "close the whole view/all the tabs". It's probably a perception thing, but I'm not sure that most people prefer it the way it is now.
A detail for @x13pixels: if you keep it without the x in the tab, there is now an empty space next to tab titles that is wasted space.
For any such detail there will be opinions on both sides. It's surely difficult for an application developer to get an idea which fraction of users prefers any single choice. Making everything a customizable option, on the other hand, increases complexity a lot. I'm certainly not alone in finding the X's bad, as I found that there was already a github issue filed on this topic. For the record: I also don't like the X in the right corner. For me, closing views is such a rare occurrence in debugging that I'd be fine with spending no screen real estate at all on closing views.
If I try to quantify it, I think for my use, the ratio of switching tabs to closing tabs in the debugger is at least 10:1 and probably approaches 100:1. There may be whole extended debugging sessions in which I don't close a single tab but switch many times. With the Xs I feel a bit like training kung fu on poles ;-).
P.S.: I think I have a second argument to defend that the Xs are objectively bad user-interface design, in addition to the point that it is a bad trade-off to use ~20% of screen area of an UI element for clicks that happen <10% and maybe less than a couple percent of the time and have a relatively high "annoyance cost" when they are made inadvertently: If you switch tabs going from right to left, the X is actually in the first area of the new tab that you reach. That means that its "effective area" (which quantifies how large of an obstacle it presents) is actually even bigger than its pixel share in the tab. It is precisely where you would prefer to click when you switch to a tab that is to the left of your initial pointer position.