You could probably say the exact thing about video game consoles and loading times/download speeds/whatever. The consoles got more and more powerful, but the games still load in about the same amount of time (or more) than they used to, and take longer to download.

And the reasoning there is the same as for this issue for webpage speed or congestion on roads; the more resources/power is available for use, the more society will take advantage of it.

The faster internet connections get, the more web developers will take advantage of that speed to deliver types of sites/apps that weren't possible before (or even more tracking scripts than ever). The more powerful video game systems get, the more game developers will take advantage of that power for fancier graphics and larger worlds and more complex systems. The more road capacity we get, the more people will end up driving as their main means of transport.

There's a fancy term for that somewhere (and it's mentioned on this site all the time), but I can't think of it right now.