It sounds like you don't really have much experience using a GriGri. If you do, have you ever had one slip?
I"m 100% not trying to argue with you, or point out you are doing something wrong(please dont read into any tone in the response, there isnt any i promise!). The biner on the slip knot would be a benefit for you IMO.
I actually I have an absolute ton(even if I cant spell it
. Yes, I have seen gri gri slip, not fail per-say. But need more feedback from your brake hand to engage the cams than expected. Ropes saturated with dirt and grit can wear on the aluminum cam plates over time and use and increaae the channel size they slip through ever so slightly over time, decreasing the amount of friction they create. I have also seen handles snap off.
Also, are you are saying I can use an ATC to rappel as long as I hold the tail end of the rope down and not apply any tension to the tail end of the rope? People will be killed doing it this way.
I dont really understand what you're saying here, an atc is desgned to create friction by holding the brake strand in the correct position. IF you cant create enough friction with the atc close to your belay loop(or bridge in this situation) it should be extended away from your body which allows hand position to be even more directly below the device and create a sharper bend in the rope.
You should try RADS to climb. The rope still locks in the GriGri when tension is removed even coming off parallel to the other strand. It does work this way, I can assure you.
I understand that the gri gri works great for RADS and does not release-its a great application. Yo-yoing is a solid way to ascend and descend in a safe, controlled manner and used a ton in high angle rescue scenarios. I was specifically talking rappelling, as that was the topic of the thread and trying to point out that the rest of the gear really wasnt necessary to "rappel" I"m glad your system works for you and you feel safe using it. There are literally 100's of ways to do things and combine techniques and hardware, that is why I generally stay out of these conversations.