Debatable whether minified JS is "open source", in the same way that compiled machine code is technically still visible, just unfeasible to comprehend (despite, or perhaps in spite of decompilers).
Anyway, minified JS lacks comments and prompts to read from. The explanation I have accepted is just the sheer massive quantity of JS code and libraries coupled with all the documentation surrounding it.
Typing characters is maybe 1% of the job. The other 99% is understanding how the change affects everything else. Changing a single line of code in a function called by 1000 other functions each themselves called in 10 other functions can still potentially be more work and a bigger change than changing 9000 lines of code in a function called once.