Ya, I have gone to all auto locking Rock Exotica and Petzl biners. I have on a number of occasions got part way up a tree and noticed I had not screwed my screw lock biner locked. Honestly, for straight spur climbing, there's a lot to be said for a good old fashion 4 strand wire core manilla flip line. With a spliced eye run thru the D rings and tied in a cats paw/ sheet bend. But. That's for loggin. . I agree with Holmen Tree I'm not too crazy about the aluminium Ds. The problem with a lot of Buckingham steel Ds is they flop back and forth. The Bashlin lineman's belt had the best Ds, steel double bar that stayed pointed forward.
I use HMS biners instead of Caritools behind the Ds on my Cougar but I once was in a hurry to get up a tree and accidentally clipped the double locking snap on my flipline into one of them.
We make mistakes when we get in a hurry or allow our mind to wander from the tasks at hand. .
In that way climbing is a lot like falling timber. You have to keep your mind on what is going on right now.