Those who don't encounter the stuff in the workshop could be blissfully unaware of the shitness that is x5 and below. It's hard to believe, but X4 and X3 are even worse; truly dreadful stuff. Fortunately they're rarely seen in the wild, partially due to low OEM uptake (because they're shit), and the rest because what did escape crapped itself and was replaced by something better, like Shimano Tourney.....
For anyone wondering how new relates to old SRAM, I did post this somewhere else a while ago:
XX/XX1 at leat remains consistent through 10, 11 & 12-sp; there was never 9-sp. XX
X0/X01 also remains somwhat consistent through 9-12-sp.
X9 applied to 9 & 10-sp, but with the advent of 11-sp. became X1. Go figure....
Similarly, X7 morphed into GX with 11-sp....
And X5 became NX. But is still really X5 and should really only be touched with a sledgehammer.