>> No one would implement a bunch of utility functions that we already have in a different module.

to be fair on this one, and while I don't flat out disagree, lots of people reinvent utility functions simply because they don't know they exist elsewhere, especially on huge code bases. This seems to get mostly rectified within the PRs, when a senior dev comments on it - the problem then is, you've only increased the number of people who now know by 1.