How to restore the shape of the tabs to tab shape and also make them visually discernible

In the new update, the gradient is mandatory which is okay fine, probably will be themes that revert that, but tabs are floating buttons. It's not the end of the world, but it's something that is both completely illogical (since they're tabs, they're linked with the window below them — they are TABS, like in a pocket phone book or office file), and visually confusing. And they're now even more weakly highlighted (there is in fact NO highlighting, only a tiny outline), it's difficult to discern which tab is active. It was already a bit hard on dark themes in recent versions. I think these are not just knee-jerk reactions, like "make it like it was", although I admit there is a part of it there. But even taking a step back, how does this improve the experience? I can't see which tab is active, the coloring is non-uniform across the wide window so it's even harder, and the tabs do not connect to their window.