It may not be possible for us to ever reach empirical definitions of "good code" or "clean code", which means that any one person's opinion about another person's opinions about "clean code" are necessarily highly subjective. I cannot review Robert C. Martin's 2008 book Clean Cod...
I think that the issue is OOP itself. Having 1-3 lines in a functionnal language (or anything that can use functional idioms) is both idiomatic, more readable and maitainable.