I felt there were limits 4 years ago. I couldn't get even an 8k context window.
It's starting to feel like the important gaps are the only ones left that need to be closed before there aren't any left. It also feels like next year they will start meaningfully closing.
I do feel there is a limit to human-s today. I did not try, but I doubt it would work if I asked literally any programmer I know "make me a web browser that is bug free, perfectly secure, works as efficient as possible on my architecture and has best UX for me personally".
Hell, I'm willing to bet they'd fail at this task even with an unconstrained snacks and kombucha budget. Humans have a long way to go. My job is safe.