Gluing things isn't really all that easy. I was unaware of how many different types of glues there are, their different strengths and weaknesses, which material

Gluing things isn't really all that easy. I was unaware of how many different types of glues there are, their different strengths and weaknesses, which materials can and cannot effectively be glued, which pairings you might want for aesthetic vs. functional reasons, which kind of glues can't be used in the presence of other factors, different strengths, the amounts that have to be used, implications on health and safety (e.g. is a glue strong enough to do x for y time). I've seen software engineering described as 'complexity management' and I think that gets closer to it than purely the use of other libraries which is commonly called just 'glue'.