In addition to "feel productive", two other feels I think are flying under the radar:
1. You get a parasocial relationship with a "friend" (or at least conversation partner) who seems to "understand" you.
2. You get some form of gambling entertainment when you pull the lever and the output keeps landing on different sides of the jackpot you want.
While #2 has some overlap with classic creative struggle, I think it can at least be seen as a kind of junk-food verson, where the frequency is different and the health-promoting parts aren't present.
That's because you would always have loosely involved but aggressive and demanding bosses (there is unfortunately an economic value to the boss whose primary task is forcing more effort out of the employee and who doesn't help coordination or anything else). So at best you had two intersecting clouds of approaches with actual accomplishment intersecting with LoC and related measurements.
The thing AI is that it provides all the tools to satisfy that loosely involved but demanding boss. So suddenly you are going to have a larger demographic of people who like LoC and feature-additions as metrics 'cause now they are easy.