I think the issue is that at one point the encounter designers shot themselves on the "One big bad hit every 60 seconds".
This had a few consequences which haunt the emergency-timer design now that the specific design is abolished (good riddance!):
First, it forced Warriors to glyph both SW and LS, and talent them too - just to have one emergency timer every 1 minute.
Second, it forced Blizzard to add Ardent Defender's 1Up, so that Paladins also have one emergency timer every 1 minute (in a certain sense).
Thirdly, it locked Death Knights and Druids into their 1m CD cooldowns.
These are effects which noticeably hurt tank diversification.
Sure there are some good things already, Paladins having only one active CD and the other being automatic. I like that, makes things less uniform.
Death Knights having more and shorter CDs.
Druids having a short CD but lacking a damage-reduction cooldown.
The only issue is kinda that the Warrior CDs are a bit... lackluster. The glyphs themselves are of questionable value now that the system of 1-kill
-per-minute has been done away with, OTOH the glyph loadouts would become too predictable if they were just removed. I don't actually see a problem with having Warriors have the stronger but longer-CD emergency abilities though. It'd make them unique in the lineup.
I guess only time and blizzard will tell.
If I had to make a Warrior now I'd probably talent the cooldowns and glyph Last Stand, Devastate and Blocking. That'd give me a 2m CD, a 3m weak CD and a 4m strong CD. I can live with that.
-- (The Death of Rats, Terry Pratchett, Soul Music)