How can Dash "disable" RBF if it was never implemented?
The "RBF Is Harmful" FUD is 100% pure buttcoiner trolling and -Classic propaganda.
There are several versions (first seen is the most conservative approach, full RBF is most radical), but don't let stop you from painting the entire range of functionality with your extra-broad "harmful" brush.
CLTV only works in Dash's testnet, while it's been working in Bitcoin's production network for months.
Altcoins are supposed to be Bitcoin's laboratories of experimentation and bring features to market sooner, not later, than the Mother Blockchain. EG, VIAcoin pioneered CLTV while DashHoles where photoshopping Coke machines.
Same point goes for SEGWIT, and other upcoming features like MAST and Schnorr sigs. It's pathetic that an altcoin with "easy hard forks" is following rather than leading.