That and the shear volume. Since you're not writing it yourself you have to figure out what it's doing if you want to be able to review it, internalize and follow how it's changing the model that the software defines. This is doable but it takes time.

Time unfortunately that you are simply not given because the whole point is to work faster so expectations of velocity have of course increased.

So you end up having to get a fuzzy idea of a given changeset, look at it a bit and evaluate quickly if it's a good change or a bad one and click it through, and on to the next thing.

At the size of PRs being whole features and doing this 5x faster than before, all you've got left as a senior is your Spidey sense. As a junior.. no idea how they cope.

We'd all love to still spend that 90% thinking time, but it used to be justified by necessity of getting the job done. Now, it's just not a luxury that is afforded.

What can ya do.. I'm slowly learning to be the best bot herder I can be, but it certainly feels like a change in skillsets. I definitely only feel like I'm able to do a good job due to enough experience and building and growing software projects over time to have an idea of what kind of decisions might bite us down the road, as well as to know what maybe can't be known but is just worth a risk. Without that kind of intuition I think I'd feel like I was really shooting blind.