Another, discussed in https://danluu.com/nothing-works/, is the oft-repeated statement that you should focus on "core competencies" which, commonly used to justify buying a SaaS solution from some startup (which then, if you're lucky, and the company doesn't fold, often turns into buying something from  Private Equity/Cisco/Salesforce/etc.).

Also, saying comments get out of date / code is self-documenting  to justify not writing comments (thx https://mastodon.social/@asmodai/111147721770157534).