> 50 LOC is industry average
Sorry, I wasn't clear. I'm talking about 50 LOC every 2 weeks or so. Like, seriously low LOC of seriously low-complexity (sometimes trivial) code.
I don't actually have a numerical target people should hit. Not at all. It's more like this: on several occasions now (all too common), I've taken over management of a team, and in our initial team meetings and 1:1s, some developer talks about what they're working on and say it's really challenging but they're making progress and making progress and making progress. Then a couple of weeks in, I look at their commit history, and they've committed 6 times in the last 3 months. I give them benefit of the doubt, those must have been 6 meaningful commits. Then the first thing that stands out, the first red flag: each commit is like 25-50 lines. At this point, I have very strong reason to think we have a problem. But of course, to confirm, you look at the code itself, and one commit is just adding a command-line argument/option to a python script. Another commit tweaks some CSS. Or does a bit of dict/list operations that any developer should be able to knock out in 30 minutes.
My first hint that I need to dig in was the low LOC. Obviously, no one goes to a performance plan because they're not "hitting numbers." And obviously, someone whose job is architecture, system design, etc, isn't coding all day, so I'm not at all concerned with how much code they're cranking out. But for those whose job is, primarily, to code, well if you're writing low-complexity code (which is OK in a lot of cases) but you're writing very little low-complexity code... that's a problem.
PS: For a couple of years on my last multi-hundred-developer project, I ran a twice-yearly Code Reduction Week, and I emcee'd the All-Hands where we celebrated the developers who deleted the most code.