Maybe. But then, sure, I can understand the code you wrote - on a syntactic/operational level. This adds Foos to bar instead of baz, and makes Quux do extra Frob() call. Whatever, that's stupid stuff below junior level. What would actually matter is for me to understand why you're doing this, what it all means. Which I won't, because you're doing some code for symbolic transformation of equations for optimizing some process, and I'm doing data exchange between our backend and a million one-off proprietary industrial formats, and we only see each other on a team call once a week.
I'm exaggerating, but only a little. Point is, in a deep project you may have domain-specialized parts, and those specialties don't overlap well. Like, ideally I'd take you aside for an hour to explain the 101 of the math you're doing and the context surrounding the change, but if neither you nor me have the time, that PR is getting a +2 from me on the "no stupid shit being done, looks legit code-wise; assuming you know your domain and this makes sense" basis.
I'm exaggerating, but only a little. Point is, in a deep project you may have domain-specialized parts, and those specialties don't overlap well. Like, ideally I'd take you aside for an hour to explain the 101 of the math you're doing and the context surrounding the change, but if neither you nor me have the time, that PR is getting a +2 from me on the "no stupid shit being done, looks legit code-wise; assuming you know your domain and this makes sense" basis.