Well, sure we CAN use it, but what he's saying is that we no longer notice. 15 years ago, ads for new computers and components had kids with their hair slicked back because of how BLAZING FAST they were going, because that's how it felt when you upgraded. Now, it's more like 'oh hey, it doesnt run like a slug anymore because this device is brand new'. People don't get new laptops because they need a faster device nowadays, they do it because they actually wore down the old one. That meme that computers are obsolete within 6 months of purchase is no longer valid, they're good pretty much until the physical components break down. Most people won't replace their smartphone until the screen, charging port, or digitizer breaks (barring the very real bleeding edge crowd that holds less ground these days).

Everything is just...adequate. People don't log on to an older machine and lament how slow it is anymore, they don't balk at how huge the new hard drives are, and consumer-grade disk speeds havent gone up since 7200rpms were introduced. Video hardware is pretty much the only technology in most computers that still has reason to march on, because game developers can always add higher textures and cooler shaders.