I don't know if that's it. Speaking from outside the tech space: most of my office jobs since 2012 have been "doing the easy/annoying tasks that had to be done, but more senior people didn't want to 'waste time' dealing with."
So, there are two parts to this:
The first is that a lot of those tasks are non-trivial for someone who isn't a digital native (and occasionally trivial for people who are). That is to say that I often found myself doing tasks that my bosses couldn't do in a reasonable time span; they were tasks which they had ALWAYS delegated, which is another way of saying that they were tasks in which proficiency was not necessary at their level.
This leads into the second part, which is that performing these tasks did not help me advance in relevant experience at all. They were not related to higher-level duties, nor did they endear me to the people who could have introduced me to such duties. My seniors had no interest in our growth as workers; anyone who wanted to see that growth had to take it into their own hands, at which point "junior-level" jobs are only worth the paycheck.
I don't know if it's a senior problem generally, or something specific to this cohort of Boomer/Gen-X seniors. Gun-to-my-head, I would wager the latter. They give enough examples in other arenas of public life to lend credence to the notion that that they simply don't care what happens to their juniors, or to their companies after they leave, particularly if there is added hassle in caring. This is an accusation often lobbed at my own generation, to which I say, it's one of the few things our forebears actually did teach us.
Yet again, AI is just a cover for mismanagement.