It does mean they're better. You keep talking about uptime, but the biggest boon to uptime for WAR is Bloodbath which is easily the least effective defensive cd in the game. You don't get to say "it lasts for 30 second! Huge uptime!" when it's really only about 30 healing per second. It is outshined significantly by Inner Beast for example. It's a decent skill for maintain. But it's 100% no replacement for an actual defensive cooldown. It doesn't help you survive burst damage, and it only really helps with prolonged sustained damage over time.
You ask any experienced main tank what they would rather have: 40% damage reduction for 10 seconds or 20% damage reduction for 20 seconds, every decent main tank will go for 40% reduction for 10 seconds. Efficacy matters more than uptime in almost every situation. With the way damage works in this game, where you can avoid many AOEs, it makes the more powerful short duration CD's even better.
WAR don't need to have equivalent CD's to PAL at at all. But it's silly to not recognize that WAR's biggest weakness is our CD's when it comes to tanking.