When guardian spirit first came out, it cost 5 pips to regenerate 25% of your health when you came back. Of course pvpers complained, so in 2012 they lowered it to 15%. The spell then became completely useless in pve. I've never used it once or seen anyone else use it
Again, pvpers complain so they make it no pvp. Well that's fine, I don't care I don't pvp. But now the spell is completely useless in both pve and pvp. At least before it had some utility in ranked pvp. Now it's just a completely useless spell all around
Since it's "no pvp", make it 25% again so it will actually be useful in boss battles and dungeons. There's no reason to leave it at 15%.