So, what would be the dumbass reason the developers would not have replay protection, other than being a dumbass?
It seems that B2x has a better price value than the previous fork! What's bothering my mind is what would be the negative side if B2x doesn't have replay protection at all? 
Without replay protection, new transactions will be equally valid on both chains as well. This means that these transactions can be copied or replayed, from one chain to the other, in other words, for them to happen on both which is commonly referred as replay attack. If you send B2X to someone, you might accidentally send him BTC as well and vice versa because they can do a replay attack with the help of a miner in both chains.may I ask what is replay protection?