[sebastialonso]

To further drive the point, almost everyone seems to be conveniently missing a great benefit of libraries: they tend to be greatly battle-tested, most of the successful ones.

The moment people start realising their own (and most likely crappy) implementation to solve problem Z and discover they didn't consider X or Y or W scenario and haven't even tested for those, most of them will hopefully understand what "balance" and "trade-off" actually mean.