People are comparing paladin to war dps, instead of tank to healer or actual dps.

Tank dps is the worst dps. Maximizing the worst dps doesn't make sense unless there is nothing better to do. Instead, maximize dd dps, followed by healer dps.

Tank dps matters when establishing threat, but beyond that, it's low priority.

Stoneskin is pretty handy for OT. Maybe not for super elite groups or whatever, but pretty much any fight where healers have to move can provide an opportunity for PLD to OT Stoneskin. It's also handy if healers are getting behind. Throw on some SS to ease up the pressure.

Or let's say a dps just died ... SS the MT a couple times. That gives healers more time to deal with the problem that just popped up without having to worry about the MT health as much. And getting up an actual dps more smoothly or keeping a situation from getting worse is more useful than doing a tiny amount of extra dps.