One argument that has been discussed is that OSRS Gold the emergence of new bosses requires graves, does it? Really? Tormented Demons was a new boss in 08 and I am not aware of any. But when I do duos with my partner I pray for him (well I bless him, but he is yet to die). I can always return it in three minutes. This means that regardless of the state of your grave it is still possible to return.
Corpreal Beast is the opposite. It has been purposely made to not use the gravestone mechanism. Jagex may have looked at it in shame at the care bear bosses who, with a minimum of risk, designed a device that doesn't care about gravestones. You have two minutes to go back to your stuff. There's no reason why you shouldn't go away until it is public property.
Finally Nex, I have yet to defeat her. It is possible to argue that Nex was designed to incorporate these features because the majority of people believe that Jagex was working on the update for some time. A blessing can help you return to your grave, however it's extremely unlikely that this feature was included in Nex's design.
In terms of the other bosses, they were created to be played without gravestones, and with real risk. A grave that does not have blessing can be used to retrieve items from Bandos or KBD, Chaos Ele or Mole. DKs, Arma, and Sara are all available in graves with blessing.
Also, graves greatly minimize the risk of RS. We are aware that Cheap RuneScape 2007 Gold there are people who will not be able to bless your grave in order to bring your rage, we understand. It's not about them having a penis. It's how the RS death sentence works and has been distorted because of graves.