Compression is not a replacement for minification. The client still needs to parse and run the uncompressed source code. Minification provides measurable performance gains for clients by reducing parse times and p̴o̴t̴e̴n̴t̴i̴a̴l̴l̴y̴ ̴e̴v̴e̴n̴ ̴a̴l̴l̴o̴w̴i̴n̴g̴ ̴f̴u̴n̴c̴t̴i̴o̴n̴s̴ ̴t̴o̴ ̴b̴e̴c̴o̴m̴e̴ ̴s̴m̴a̴l̴l̴ ̴e̴n̴o̴u̴g̴h̴ ̴t̴h̴a̴t̴ ̴t̴h̴e̴y̴ ̴c̴a̴n̴ ̴b̴e̴ ̴i̴n̴l̴i̴n̴e̴d̴ (the inclining part is not true anymore; see child comment).
Licence retention isn't a reason to skip minification either. Practically every modern minified retains licence comments.
And finally, your users can still read the original source code if you ship source maps.
Care about your users, please minify your JavaScript :)