We'd still avoid it.
Keep in mind DRK has the highest dps of all the tanks and is simultaneously the least popular in both Normal and Savage raids. Gameplay is important. There's also the most important fact, that WHM is rubbish at healing and even dps spamming healers are playing the role to keep their party alive and want a class that does that effectively.
WHM wouldn't even be taken in speedruns unless its damage was significantly higher than the others. Speed run groups are typically AST/SCH, because AST is so good at healing SCH can lean on them to get extra Energy Drains out. SCH can't lean on WHM at all, WHM has to lean heavily on others to optimize.