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Ye fair. I've also specifically trained my grip (well, finger strength, but hey) for climbing before, which may be a reason it's not limited me in deadlifting.
The principle you're communicating applies to all kinds of things too, like doing only the top part of a bench press when that limits you, rack pulls for deadlifts or 1.5 rep deadlifts etc, it's a legit concept and a good application for straps when grip limits you, the only reason I was saying anything is why I don't do it rather than saying it shouldn't be done. The bit I said about compound lifts should have had an additional "for me" in there to clarify that.
So do it then. Its for a reason.
Because the weakest link by far, is your grip. And it's not only by a little- It's huge. Training your grip independently would yield better results than trying to train it in a deadlift sesh.
*obvious disclaimers are on climbers and ground work martial artists and anyone that uses gripstrength. Might be you.... Obviously.