system
A chat on subreddit /r/pcmasterrace
human
More like hardware companies are lazy with drivers. Historically hardware has been scaling at a much slower pace than software. For instance, why programs are forced to be multithreaded now as they can't rely on single-threaded performance growing significantly any time soon.
gpt
We can't easily increase single thread speed at the moment because current architecture is at pretty hard miniaturization limit.  We already build processor transistors small enough that they need to be built to account for quantum tunneling, so the only ways forward to increase speed are adding more parallel circuits (threads) or an advance in quantum computing that we might be waiting decades or centuries for.