Title: "Your Makefiles are wrong"

Content: A lot of subjective preferences, with the only thing people are probably doing "wrong" being not properly mapping files as inputs and outputs (which could be a correctness problem but is probably either a mere inefficiency or complete non-issue).

If this had been titled, say, "An opinionated approach to writing Makefiles", or perhaps "How to use GNU Make in a completely unorthodox way that I really like", I wouldn't mind it so much.