That might be true for you. For me, I can stay in flow state so long as I'm progressing, even if progressing doesn't involve writing every line by hand. Whereas I easily fall out of flow state as soon as I am frustrated by an inability to remember some particular bit of syntax, or a particular bit of architecture, or a particular code pattern.

For me, AI has been a godsend for productivity because it's great at what I'm bad at. I'm not spending 99% of my day grinding away at C++ code; I'm never writing enough for it to become a world class language expert. I'm jumping between SQL queries, CSS, Java, bezier curves, Python, and shell. If I need to write something in a language I touch infrequently (e.g. Go or Ruby) it's nice to have individual blocks of code generated for me, so that I'm not slowed down by my ignorance on a language's iterator syntax, or whatever.