I think laziness probably played a role, at least early on. There was an experiment in the 1960s (using a very loose definition of that word in the modern sense) which looked at harvesting grain in the Fertile Crescent using stone age tools. They found you could get about 1 kg of usable grain an hour that way, which would produce a slight surplus of calories for a year for a single person in about 200 hours (the number I saw was 3 weeks, but I did some back of the napkin math to check it). Barring the complications of figuring out how to actually store that much grain all at once, and actually learning to cultivating it intentionally, it seems like it might have been preferable to foraging constantly for some folks. Plus, it probably would have proven to be a more stable food source once people figured out storage, so lean months would have been a bit easier.

It was shortsighted laziness, though, because farming is definitely hard work, and likely no one expected it to become such a huge time sink.

https://belleten.gov.tr/tam-metin/1322/eng (Sorry for the slightly weird source; I couldn't find the original paper not behind a paywall, but it seems like a not-terrible journal)

I think it was more about food stability.