Fully agreed in that this can be heavily subjective. And some things are flat out difficult with no real way of saying what is "too big."
My point on PGO/BOLT not being relevant was more that I see people reaching for libraries to do things such as add retries to a system. I don't think it is a terrible idea, necessarily, but it can be bad when combined with larger "retries plus some other stuff" libraries.
Now, fully granted that it can also be bad when you have developers reimplementing complicated data structures left and right. There has to be some sort of tradeoff calculation. I don't know that we have fully nailed it down, yet.
My point on PGO/BOLT not being relevant was more that I see people reaching for libraries to do things such as add retries to a system. I don't think it is a terrible idea, necessarily, but it can be bad when combined with larger "retries plus some other stuff" libraries.
Now, fully granted that it can also be bad when you have developers reimplementing complicated data structures left and right. There has to be some sort of tradeoff calculation. I don't know that we have fully nailed it down, yet.