Too many are buggy and/or poorly documented and take lots of trial and error to get working as intended. And you create a dependency mess by including lots of pluggins/libraries. It may be quick up front, but can jack maintenance after say 5-ish years. Multi-K-lines-of-code libraries "rot" as environments change. If you can write a shop-tuned version in say 300 lines, do it, because it's easier to fix later. Select vendor libraries/pluggins judiciously.