Dupes for LRs just show you how immensely overpowered every single one of them are.
I have LR SV with 2 dupes and LR boujack with 2 dupes (though I use 1 dupe for linking), these are old ass LRs and they still just bulldoze anything you put in front of them.
LR Gohan and Goten with dupes? Absolutely and utterly ridiculous. Even at free dupe, they are the entire reason why I was able to beat 3 different sbrs, back to back, with ease.
Though I must say I do value LRs, or I guess cards in general, that have really stacked defence, more than those that don't but have super high damage.
Like LR ss3 goku deletes lifebars like nothing, but afterwards he's completely defenseless, so he's not that great for tougher events like SBR and you kinda have to keep him doing 12ki instead.
Compare that to UR piccolo and nail, who become fucking impervious to any kind of damage when on rotation together; I'd run them over some hard hitting LR any day of the week, because when you aren't taking damage, you win by default.
This is also the reason why I still regard androids as one of the best teams in the game; really nice defence on all of them and just non-stop heals. The new LR cell on androids would almost be like a cheat code.