That doesn't stop some of the people at WP from reverting everything. Which means OP's friend is left to either leave it reverted, or trawl through the various arcane dispute resolution / meta pages, arguing their case, building consensus, to eventually get people saying it should be left in. Or saying it should be left out because those meta pages sometime feel as random as tossing a coin.
Unsurprisingly this optimizes for people who tolerate vast amounts of meta bullshit, and not people who know what they're talking about and know what the good sources are.