For example, I have found Claude Code and Codex to be tremendously helpful for my web development work. But my results for writing Zig are much worse. The gap in usefulness of agents between tasks is very big.
The skill ceiling for using agents is also surprisingly high. Planning before coding, learning agent capabilities, environment setup, and context engineering can make a pretty massive difference to results. This can all be a big time sink though, and I'm not sure if it's really worth it if agents don't already work decently well for the work you do.
But with the performance gaps between domains, and the skill curve, I can definitely understand why there is such a divide between people claiming agents are ridiculously overhyped, and people who claim coding is fundamentally changing.