"Don't do X" is bad. "Don't do X because it's not a best practice" is less bad, but still bad. "Don't do X because Y" is good. Only in the last one you can eit

"Don't do X" is bad. "Don't do X because it's not a best practice" is less bad, but still bad. "Don't do X because Y" is good. Only in the last one you can either understand the reason, or ignore the rule because it doesn't apply to your situation.