Two of the three complaints are about Windows specifically (resizing windows and lack of application titlebar info). The 3rd appears to be an issue the author has with the theme they have applied in VSCode, which doesn't seem to match the theme shown on the VSCode homepage, which clearly shows which tab is active.
There's no look at macro trends nor software outside of the MS ecosystem.
When I glance at the VSCode home page, the only thing which clued me in on which tab is active is the fact that there are two gray ones but only one black one. If there were only two tabs open, I'd have expected the gray one to be the active one. Sure, the argument is probably that the active tab color should match the background, which is black, but I still think it is a terrible UI.
And I really agree with the sibling comment about "wait, those are tabs?" Can't tell you how many times I've had that thought cross my mind. Not just for tabs, either, but for many types of UI elements. It really is a shitshow these days.