Ask HN: Has single-task focus become outdated in the AI era?

I’ve always found that deep focusing on one task at a time was the only way to get things done at work with good quality and at an acceptable pace, and I have a real hard time multitasking (even with AI) because of context switching and getting distracted or overwhelmed.

But with AI making parallel work easier (in theory), is single-task focus now a disadvantage? Are effective engineers always running several threads at once, or is deep focus still the best way to get things done?