The future being grimdark isn't new, that's true.
But humanity had so much finding out to do. Average material conditions haven't moved steadily forwards, no, but humanity has been overall rising. Science and technology developing, insights to the natural world happening & spreading, cultural elements forming & flourishing. The powers that be in the world were quite regionalized, had their fingers in only small pies: there was similarities across the world but it was characterized more as many individual experiments rising and falling, a variance among societies where many things were being tried in many ways. The difficulty in survivng (for much of this time) was overall characterized by the difficulty of finding food in the world, which was brutal work but work against nature.
Today, things are so different. We all see (or can see if we want) the whole world. Progress has tapered down. The bold efforts for progress like the New Deal and international order (UN) have been worn down or unrepaired (notably the security council sotuation). But more than all that, we have lost the civilizational diversity that fed change and growth. We don't try new things, our systems don't shift: we are locked on course, path dependence amid the vast global network of international trade. The efforts to try new things are small tweaks, of limited scope: Obamacare (much protested), 4 day work weeks, some small scale UBI. We have seen so few attempts to house and feed the populations of the world, so few attempts to broaden education. The millions of enterprises across the world keep being hoovered up into ever larger companies with ever more high up and far off seats of power, the 0.1%'s ascent over us all and control of the world's money supply and markets extends and extends.
The stagnancy and unflinching singular trajectory we are all locked into is pitiful. Humanity feels so a long for the ride of a couple absolutely insane pathological freaks. That loss of diversity, the consolidation of many things into fewer and fewer, is an evolutionary stagnancy which even if unconsciously experienced weighs enormously heavy on the human souls of today. It feels terrible, feeling like as the wheel turns, it's not the rise and fall of civilizations, but now the plight of us all, enmeshed, and knowing that we do so very little have so few levels to pull, so few positions of any real power to steer this.