The question, really, is: are you confident that this was better than actually writing the whole thing yourself? Not only in terms of how long it took this one time, but also in terms of how much you learned while doing it.
You accumulate experience when you write code, which is an investment. It makes you better for later. Now if the LLM makes you slightly faster in the short term, but prevents you from acquiring experience, then I would say that it's not a good deal, is it?
I tried LLMs several times, even started using my phone's timers, and found out that just writing the code I need by hand is quicker and easier on my brain. Proof-reading and looking for correctness in something already written is more brain-intensive.
Everyone isn't "generating and moving on". There's still a review and iteration part of the process. That's where the learning happens.