Note: after proofreading and review this page could be considered for inclusion into Debian Upstream Guide
Pledge against minification (draft)
Minification is ugly
It makes code impossible to study, read and modify. Also it makes much harder to produce meaningful bug reports.
In some cases minification removes important information such as license and copyright attribution, link to project's home page or even version number.
Minification can introduce bugs
Minification does a very poor job
Presumably minification attempts to save few seconds during initial page load. On properly configured web server subsequent requests to the same minified file will be satisfied from browser cache. Server side GZipping does better job without obfuscating the code.
Also I'm yet to see evidence that minification improves execution speed. Most pages (except ones opened by mistake) will remain opened longer than it takes to load them therefore speed of execution is more important than speed of loading. I know for a fact that some XML parsers work significantly slower with "minified" XML without line breaks (e.g. one very long line) comparing to "beautified" XML code.
Minification is a bad practice