"Because that is what people who know more about this than all of us combined have come to that conclusion"? Sounds snark but I mean that's what it boils down to anyway.
You can cite meta-analysis, like in medicine. "The people who studied this concluded that using this method has a higher chance of bad side effects and lethal complications than using the suggested method".
For people on larger teams, or working next to teams of developers, "use X not Y" will lead to pushback of "why not?" and full answers will be needed.