Skill/spell speed is OK. Another issue with it is that it doesn't build efficiency like crit and det do. Speed makes you do more damage but you'll also burn more TP. Or mana, because of this BLM makes good use of skillspeed but on a WHM too much of it, without the supporting pie, can make longer battles harder.

Tanking Wars don't really need to worry about running out thanks to IB and pacification but I understand palys can have some issue with it.