Assuming I'm going to need the complexity more than 1-2 times in my source code, I'm going to be writing my own abstraction. Which takes time, needs tests writing, and I am going to make a typo or other silly mistake somewhere.

Run into a couple of examples of such complexity, and the dependency is well worthwhile.

A jQuery that can be tree-shaken would be awesome, as there are parts I use regularly and others I have never used. Ironically the -lite bundle leaves outs parts I use frequently...

Just look at the cost-benefit. Typically internal code has a defect rate of around 1/1000 lines, so 10-15 lines is about 0.01 bugs. 86.1Kb of an established, widely used library is a cost that I can't meaningfully distinguish from zero.