Considering seals are a form of military currency, it would be a lot more like Sigil (which was superior anyway) than Signet. For those that don't know/afraid of Sigil, it basically gave you Regen/Refresh under 50%ish life Defense/Evasion/Attack/Accuracy bonus against monsters 3 levels above as well as monsters below you and a small bonus while doing Campaigns.

Why people would be against that is beyond me, but I suppose since FFXI is an MMO SE created before it's a bad thing, if WoW, Rift or SWTOR did it people would be all over it.